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Traditional Chinese Medicine Usage among Schizophrenia Patients

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a v a i l a b l e a t w w w . s c i e n c e d i r e c t . c o m

j o u r n a l h o m e p a g e : w w w . e l s e v i e r h e a l t h . c o m / j o u r n a l s / c t i m

Traditional Chinese medicine usage among

schizophrenia patients

Herng-Ching Lin

a

, Wei-Chung Vivian Yang

b

, Hsin-Chien Lee

c,d,∗

aTaipei Medical University, School of Health Care Administration, 250 Wu-Hsing Street, Taipei 110, Taiwan bTaipei Medical University, Graduate Institute of Biomedical Materials, Taiwan

cTaipei Medical University Hospital, Department of Psychiatry, Taipei, Taiwan

dTaipei Medical University, School of Medicine, Department of Psychiatry, Taipei, Taiwan

Available online 18 January 2008

KEYWORDS Traditional Chinese medicine (TCM); Schizophrenia; TCM usage Summary

Objective: This study uses a nationwide population-based dataset to explore factors and

pat-terns associated with traditional Chinese medicine (TCM) usage among schizophrenia patients.

Design: A retrospective population-based study. Administrative claims data obtained from the

Taiwan National Health Insurance Research Database covering the periods 1996—2004 was used to examine patients hospitalized with schizophrenia between 1996 and 2001 (n = 34,100) to determine whether they had visited TCM practitioners in 2004 for treatment of schizophrenia.

Setting: Taiwan.

Main outcome measures: Independent variables included patient’s age, gender, comorbid

medical disorders, number of visits to clinics, number of hospitalizations, income and the geographical location and urbanization level of patients’ residences. Multivariate logistic regressions were performed to determine the association between these factors and visits to TCM practitioners for the treatment of schizophrenia.

Results: 3144 of the patients (9.2%) had visited TCM practitioners during 2004. After adjusting

for other factors, the odds of such visits by males were found to be 0.825 times those for females, with the odds decreasing with patient’s age and urbanization level. The odds of visits to TCM practitioners for patients hospitalized more than once were 3.557 times as high as those for other patients, while those for patients with≥50 prior visits to other conventional clinics were 54.9 times those with≤10 prior clinic visits.

Conclusions: We conclude that patient’s gender, age, geographical location, urbanization level,

severity of illness, number of visits to clinic, income and the presence of diabetes and hyper-tension all have significant associations with TCM usage.

© 2007 Elsevier Ltd. All rights reserved.

Corresponding author. Present address: Department of Psychia-try, Taipei Medical University and Hospital, 252 Wu-Hsing St.,Taipei 110, Taiwan. Tel.: +886 2 2736 1661x3613; fax: +886 2 2378 9788.

E-mail addresses:henry11111@tmu.edu.tw(H.-C. Lin), ellalee@tmu.edu.tw(H.-C. Lee).

Introduction

A substantial increase has been noted in the use of com-plementary and alternative medicine (CAM) in Western countries, with various studies having reported that more than one-third of all Americans had, at some time during the

0965-2299/$ — see front matter © 2007 Elsevier Ltd. All rights reserved. doi:10.1016/j.ctim.2007.11.001

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past decade, used CAM for a variety of health problems.1—4It

is even reported in some studies that the use of CAM appears to be higher among people with psychological disorders than among the general population as a whole.5

A national survey carried out in 1997 by Kessler et al. reported that 56.7% of adults who had complained of anxi-ety attacks had used CAM to treat their condition during the previous year, as did 53.6% who had complained of severe depression.2 Wu et al.6 also reported that 54% of women

suffering from depression had reported some use of CAM during the previous year. Indeed, several studies have con-cluded that psychological disorders were one of the primary factors leading to CAM usage.7,8

Nevertheless, despite the profusion of studies under-taking investigations into the use of CAM as a treatment protocol for patients with psychological disorders, to the best of our knowledge, there have been very few studies addressing the patterns of CAM usage among patients with specific mental disorders. Russinova et al.9reported that of

the 40 adult schizophrenia patients examined in their study, 15% had used herbs at some time for their mental problems; it is, however, clear that no unequivocal conclusions could be drawn from such a small and unrepresentative sample. Furthermore, as in the majority of the prior studies, the Russinova et al.9study used survey research work to

ascer-tain CAM usage, as opposed to examining the use of CAM among psychiatric patients in the ‘real world’.

Despite the obvious diversity in the varieties of CAM, there has been a general tendency in the prior studies to include several different CAM varieties into a single cat-egory. Furthermore, the patterns and factors associated with the use of remedies derived from a person’s native or ancestral culture may also differ from practices in other cultures; indeed, within Chinese communities, the use of traditional Chinese medicine (TCM) has prevailed for more than 2000 years as the ‘conventional’ method of treating mental disorders.10 Today, TCM remains the most popular

form of CAM usage in Taiwan among people suffering from mental disorders.11

Based on prior studies, it is reasonable to assume that schizophrenia patients in Taiwan may use TCM at a higher rate. However, it is probable that the patterns and factors associated with TCM usage among schizophrenia patients in Asian countries will differ from findings of prior stud-ies in Western ones. Because TCM usage may interact with concomitant psychiatric treatment, either positively or adversely, mental health professionals need more infor-mation on this issue. This study therefore, sets out to explore the patterns and factors associated with TCM usage among schizophrenia patients in Taiwan, using a nationwide population-based dataset.

Initiated in March 1995, Taiwan’s National Health Insur-ance (NHI) program finInsur-ances health care for all citizens of Taiwan. Characteristics of Taiwan’s NHI include; universal coverage, a single-payer payment system with the govern-ment as the sole insurer, comprehensive benefits, access to any medical institution including conventional medicine or TCM according to the patient’s choice, very low out-of-pocket expenses (visiting allopathic and TCM clinics costs patients the same amount), and a wide variety of providers well distributed throughout the country. Allopathic and TCM practitioners compete with one another for patients.

By comparing our results with the findings of various studies undertaken in Western countries, we may be able to provide some hint as to the future trends in TCM usage among schizophrenia patients in Chinese communities. This study could also have some important policy implications for mental healthcare professionals and policymakers; by facil-itating cross-country comparisons, a better understanding may emerge of the help-seeking behavior of schizophrenia patients and the factors influencing their decision to adopt the use of CAM.

Method

Database

This study uses administrative claims data from the National Health Insurance Research Database (NHIRD), published by the National Health Research Institute in Taiwan, cover-ing the years 1996—2005. The dataset includes all medical claims data from the National Health Insurance (NHI) program, covering in excess of 21 million people, and thereby representing around 96% of the island’s popula-tion.

The NHI system is characterized by a single-payer pay-ment system with all patients having unrestricted access to any healthcare provider of their choice. Various modalities of TCM provided by board-certificated practitioners, includ-ing Chinese herbal remedies, acupuncture and manipulative therapy, have already been covered by the NHI program and are readily available. Thus, the NHRID offers a unique oppor-tunity to explore actual TCM usage among schizophrenia patients in the real world.

Study sample

All patients admitted to hospital psychiatric departments in Taiwan between January 1996 and December 2001 with a principal diagnosis of schizophrenia (ICD-9-CM codes 295.XX) were selected as our study sample from the dataset (n = 34,137). Those patients under 18 years of age (n = 37) were excluded in order to limit the study sample to the adult population of Taiwan. Ultimately, we were left with a sample of 34,100 eligible schizophrenia patients.

Key variables of interest

The dependent variable in this study was whether or not the patients had visited TCM practitioners in 2004 for the treat-ment of schizophrenia. Since the NHIRD includes all medical claims data on ambulatory care visits, this allows us to iden-tify whether the patients had ever visited TCM practitioners during that particular year.

The key independent variables of interest included; the age and gender of the patient, comorbid medical disor-ders (specifically, hypertension and diabetes, which have been observed to have higher rates among schizophrenia patients12), the level of urbanization and geographical

loca-tion (Northern, Central, Eastern and Southern Taiwan) of the patient’s community of residence, the number of visits to clinics in 2004, the number of hospitalizations in 2003 and

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2004 and the monthly income. The patients were divided into one of four age groups, 18—24, 25—34, 35—49 and≥50 years.

In accordance with the standards published by the Tai-wanese National Health Research Institute, urbanization levels in Taiwan comprise of seven strata, with level 1 referring to the ‘most urbanized’ communities and level 7 referring to the ‘least urbanized’ communities. These standards include the population density of the community (people/km2), the proportion (in percentage terms) of peo-ple educated to college level or above, the proportion (in percentage terms) of elderly people within the community (those over the age of 65 years), the proportion of agricul-tural workers per 100,000 of the population and the number of physicians per 100,000 of the population. In this study, however, we take the level of urbanization of the commu-nity in which the patients resided as comprising of only five strata. This is essentially because there were very small numbers of schizophrenia cases in levels 5—7; thus, these three levels were combined into one single group, which we now refer to as level 5.

Since the data on the severity of the patients’ illnesses was unavailable from the NHIRD, we used the number of hospitalizations for the treatment of schizophrenia in 2003—2004 as a proxy for the severity of the disease. This variable comprised of three alternatives, 0, 1 or≥2. Finally, the monthly income was split into three levels: 0, NT$1-9999 and≥NT$10,000.

Statistical analysis

The SAS statistical package (SAS System for Windows, Ver-sion 9.1) was used to perform the statistical analysis of the data in this study, with descriptive statistical analyses, including the frequency, percentage, mean and standard deviation, being performed on all of the identified variables. Pearson’s2-tests were also carried out to determine the sig-nificance of the crude associations between the independent variables and TCM usage. Multivariate logistic regressions were then performed with TCM usage as the dependent variable (yes = 1, no = 0), and the independent variables comprising of the age and gender of the patients, comorbid medical disorders, the level of urbanization and geograph-ical location (Northern, Central, Eastern and Southern Taiwan) of the community in which the patients resided, the number of hospitalizations in 2003—2004 and the monthly income. A two-sided p-value of≤0.05 was considered to be statistically significant.

Results

Of the total sample of 34,100 schizophrenia patients, 3144 (9.2%) had visited TCM practitioners for the treatment of schizophrenia during 2004; details on the demographic dis-tribution of the sampled patients are provided inTable 1, which shows that the mean age of the sampled patients was 41.0 (±7.4) years.

Of the total number of patients, 15,162 (44.5%) had not been hospitalized between 2003 and 2004, while 2580 patients (7.6%) had complications of diabetes and 3142 (9.2) had complications of hypertension. Surprisingly, 11.6% of the

Table 1 Descriptive analysis of sampled schizophrenia patients in Taiwan, 2004a

Variables Total no. %

Gender Male 19,255 56.5 Female 14,845 43.5 Age 18—24 1,790 5.3 25—34 9,107 26.7 35—49 16,003 46.9 ≥50 7,200 21.1 Geographical location Northern 15,093 44.3 Central 7,324 21.5 Southern 10,052 29.5 Eastern 1,631 4.8 Urbanization level 1 (highest) 8,272 24.3 2 9,399 27.6 3 5,391 15.8 4 4,921 14.4 5 (lowest) 6,117 17.9 Number of hospitalizations in 2003—2004 0 or 1 19,230 56.4 ≥2 14,870 43.6

Number of visits to clinics in 2004

≤10 12,212 35.8 11—24 11,231 32.9 25—49 6,691 19.6 ≥50 3,966 11.6 Monthly income 0 6,537 19.2 NT$1-9,999 16,796 49.3 ≥NT$10,000 10,767 31.6 Diabetes Yes 2,580 7.6 No 31,520 92.4 Hypertension Yes 3,142 9.2 No 30,958 90.8

a Total sample number = 34,100.

sampled patients had visited conventional clinics on more than 50 occasions in 2004.

The demographic distribution of the sampled patients, by TCM usage, is presented in Table 2, where the Pear-son’s 2-tests reveal that visits to TCM practitioners had significant correlations with patient gender (p = 0.021), age (p < 0.001), geographical location (p < 0.001), urban-ization level (p < 0.001), the number of hospitalurban-izations in 2003—2004 (p < 0.001), the number of visits to clinics in 2004 (p < 0.001), the monthly income (p < 0.001) and whether a patient’s condition was complicated by diabetes (p < 0.001) or hypertension (p < 0.001).Table 2also presents the unad-justed odds ratio estimates of the likelihood of patients visiting TCM practitioners.

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Table 2 Distribution of the characteristics of sampled schizophrenia patients in Taiwan, by traditional Chinese medicine usage, 2004a

Variables Traditional Chinese Medicine Usage OR 95% CI p-Value

Yes No

Total no. % Total no. %

Total 3144 9.2 30,956 90.8

Number of TCM visits, mean (S.D.) 6.8 (± 9.6) Gender* Male 1715 8.9 17,540 91.1 0.918 0.853—0.988 0.021 Female 1429 9.6 13,416 90.4 1.000 Age*** 18—24 229 12.8 1,561 87.2 1.000 — — 25—34 1059 11.6 8,048 88.4 0.906 0.772—1.063 0.225 35—49 1451 9.1 14,552 90.9 0.679 0.581—0.793 <0.001 ≥50 405 5.6 6,795 94.4 0.407 0.341—0.487 <0.001 Geographical location*** Northern 1342 8.9 13,751 91.1 1.000 — — Central 822 11.2 6,502 88.8 1.320 1.201—1.452 <0.001 Southern 895 8.9 9,157 91.1 1.010 0.921—1.108 0.830 Eastern 85 5.2 1,546 94.8 0.534 0.421—0.678 <0.001 Urbanization level*** 1 (highest) 805 9.7 7,467 90.3 1.000 — — 2 918 9.8 8,481 90.2 1.027 0.926—1.140 0.609 3 520 9.7 4,871 90.4 0.997 0.883—1.126 0.961 4 459 9.3 4,462 90.7 0.986 0.870—1.118 0.831 5 (lowest) 442 7.2 5,675 92.8 0.741 0.654—0.841 <0.001 Number of hospitalizations in 2003—2004*** 0 or 1 558 2.9 18,672 97.1 1.000 — — ≥2 2586 17.4 12,284 82.6 6.747 6.132—7.422 <0.001

Number of visits to clinics in 2004***

≤10 109 0.9 12,103 99.1 1.000 — — 11—24 371 3.3 10,860 96.7 3.793 3.059-4.703 <0.001 25—49 1079 16.1 5,612 83.9 21.347 17.486—26.060 <0.001 ≥50 1585 40.0 2,381 60.0 73.910 60.574—90.182 <0.001 Monthly income*** 0 564 8.6 5,973 91.4 1.000 — — NT$1—9,999 1476 8.8 15,320 91.2 1.008 0.907—1.120 0.882 ≥NT$10,000 1104 10.3 9,663 89.8 1.208 1.082—1.349 <0.001 Diabetes*** Yes 304 11.8 2,276 88.2 1.401 1.231—1.595 <0.001 No 2840 9.0 28,680 91.0 1.000 — — Hypertension*** Yes 325 11.2 2,790 88.8 1.294 1.145—1.462 <0.001 No 2792 9.0 28,166 91.0 1.000 — — *Indicates p < 0.05;*** indicates p < 0.001.

a Total sample number = 34,100.

Table 3 provides the adjusted odds ratio estimates of the likelihood of patients visiting TCM practitioners for schizophrenia treatment. After adjusting for other factors, the odds of male patients visiting TCM practitioners for such treatment were 0.825 times (95% CI = 0.756—0.900,

p < 0.001) those for females, with the odds ratios of visits

to TCM practitioners decreasing with the patient’s age.

Interestingly, the odds ratios of visits to TCM practition-ers also decreased with urbanization level. As compared to patients living in the highest urbanization level (level 1), the respective odds ratios of visits to TCM practitioners for patients living in levels 4 and 5 (the lowest levels) were 0.798 and 0.671.Table 3also indicates that for patients with≥2 hospitalizations, the odds of visiting TCM practitioners were

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Table 3 Adjusted multiple logistics regression analysis of relationships between traditional Chinese medicine usage and schizophrenia patient characteristicsa

Variables Traditional Chinese medicine usage

OR 95% CI p-Value

Gender

Male 0.825 0.756—0.900 <0.001

Female (reference group) 1.000 — —

Age 18—24 (reference group) 1.000 — — 25—34 0.802 0.667—0.964 0.019 35—49 0.626 0.522—0.752 <0.001 ≥50 0.321 0.261—0.394 <0.001 Geographical location

Northern (reference group) 1.000 — —

Central 1.383 1.232—1.552 <0.001

Southern 0.930 0.838—1.033 0.176

Eastern 0.579 0.448—0.747 <0.001

Urbanization level

1 (highest) (reference group) 1.000 — —

2 0.923 0.821—1.038 0.181 3 0.962 0.836—1.106 0.584 4 0.798 0.688—0.926 0.003 5 (lowest) 0.671 0.580—0.777 <0.001 Number of hospitalizations in 2003—2004 0 or 1 (reference group) 1.000 — — ≥2 3.557 3.209—3.943 <0.001

Number of visits to clinics in 2004

≤10 (reference group) 1.000 — — 11—24 3.570 2.876—4.431 <0.001 25—49 15.610 12.751—19.109 <0.001 ≥50 54.904 44.772—67.327 <0.001 Monthly income 0 (reference group) 1.000 — — NT$1-9,999 0.990 0.876—1.118 0.867 ≥NT$10,000 1.364 1.198—1.554 <0.001 Diabetes Yes 1.334 1.163—1.530 <0.001 No (reference group) 1.000 — — Hypertension Yes 1.505 1.321—1.716 <0.001 No (reference group) 1.000 — —

aTotal sample number = 34,100.

3.557 times (95% CI = 3.209—3.943, p < 0.001) as high as those for patients who had been hospitalized on only one occasion, or not at all.

Rather surprisingly, the odds of visiting TCM practition-ers for patients with ≥50 visits to clinics in 2004 were 54.904 times those for patients who had undertaken≤10 visits to clinic in 2004. As expected, the number of visits to TCM practitioners increased with the monthly income; those patients with monthly income in excess of NT$10,000 were 1.364 times (95% CI = 1.198—1.554, p < 0.001) more likely to visit TCM clinics than those with no income. Interestingly, the adjusted odds of visiting TCM practitioners for patients

whose condition was complicated by diabetes or hyperten-sion were 1.401 (95% CI = 1.231—1.595, p < 0.001) and 1.294 (95% CI = 1.145—1.462, p < 0.001) times, respectively, com-pared to those who did not have diabetes or hypertension.

Discussion

This nationwide population-based study reveals that, at some time in 2004, 9.2% of the sampled schizophrenia patients had visited TCM practitioners in Taiwan. The mean frequency of visits to TCM clinics among this population was

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6.8 (±9.6), with about 20% of the patients having visited TCM practitioners in excess of 10 times in that particular year. However, all of the TCM users continued to utilize conven-tional psychiatric services. Thus, as previously suggested,5

TMC usage in Taiwan may be better regarded as an add-on (complementary) to cadd-onventiadd-onal psychiatric care rather than a substitute (alternative). It nevertheless remains dif-ficult to provide a precise answer to the question of why people with mental disorders tend to turn towards TCM.

‘Dissatisfaction’, the first of three hypotheses proposed to explain CAM usage,7 is based upon the rationale that

patients may be dissatisfied with conventional treatment because of its inhumanity, ineffectiveness, adverse effects or high costs; and indeed, higher rates of dissatisfaction with conventional services have been reported among CAM users with mental disorders.5In our study, schizophrenia patients

who used TCM still received psychiatric treatments. As sug-gested by Eisenberg et al.13it seems that TCM usage among

schizophrenia patients does not necessarily reflect dissatis-faction with allopathic care.

The second hypothesis relates to ‘philosophical congru-ence’, which suggests that CAM provides more attractive therapies since they are regarded as being more compati-ble with the users’ values, beliefs and perspective of the world. Astin7concluded that those using CAM appeared to

do so largely because they found CAM to be more congruent with their own values, beliefs and philosophical orientation towards health and life. The third hypothesis is the need for personal control14; people favor CAM because they see it

as offering more personal autonomy and control over their healthcare decisions.

Also based on the NHIRD, Chen and colleagues reported that the use of TCM and acupuncture for mental disorders is far less than for other medical conditions.10,15Since

diag-noses in the NHIRD are according to the ICD-9-CM, which is often quite different from disease entities in TCM, actual TCM usage for mental conditions is very likely underesti-mated due to differences in coding.

Our study finds that females are more likely to visit TCM practitioners, which is consistent with the findings of the majority of the prior studies.16,17 Indeed, while the first

of the national surveys by Eisenberg et al.4 was unable to

determine any significant gender difference in CAM usage, their follow-up survey nevertheless showed that CAM usage was more common among women. Kessler et al.2

neverthe-less, demonstrated that the gender difference disappeared when further analysis was performed among respondents suffering from anxiety and depression. Thus, it remains an open question as to whether gender differences exist in CAM usage.

The results of this study indicate that younger schizophrenia patients have a greater tendency to visit TCM practitioners. This comes in light of the Druss and Rosenheck8study, which found that CAM usage was

particu-larly prevalent among younger individuals reporting mental conditions. In the two studies by Eisenberg et al.4,18 CAM

usage was also found to be significantly more common among people aged 25—49 years (and 35—49 years). It has been sug-gested that the impact of age on CAM usage can be explained by cohort effects18; if that is true, given the gradual increase

in younger cohorts of schizophrenia patients, TCM usage is likely to become increasingly popular.

We find that visits to TCM practitioners have significant correlations with both the monthly income and geograph-ical location. This is consistent with the majority of the prior studies on the factors associated with CAM usage, each of which concluded that higher income and residing in the Western areas of the US were associated with CAM usage.4,5,8

Surprisingly, we also find that the odds of visits to TCM practitioners for patients with ≥50 visits to conventional medicine clinics were as high as 54.9 times those for patients with≤10 clinic visits. This is in line with the conclusions of a study which found that, as compared to non-users, CAM users in Taiwan were associated with more frequent visits to conventional clinics.11 This pattern of service

uti-lization may indicate different help-seeking behavior among schizophrenia patients who are also TCM users.

Interestingly, we also find that that the odds of visits to TCM practitioners for patients with ≥2 hospitalizations were about 3.6 times those for patients who, in the previ-ous 2 years, had been hospitalized on only one occasion, or not at all. In other words, patients with more active psychopathology had a greater propensity for visiting TCM practitioners. This is consistent with the findings of Burstein et al.19which concluded that CAM usage was associated with

greater physical symptoms, as well as the greater intensity of the symptoms, for women who had been recently diag-nosed with early stage breast cancer. It is quite feasible that patients with more active psychopathology have higher lev-els of emotional disturbance, and are thus, in turn, more highly motivated to seek additional methods of treatment.11

This study also finds that the adjusted odds ratios of patients visiting TCM practitioners decreased with the level of urbanization. To the best of our knowledge, no prior study has ever explored the relationship between CAM usage and the level of urbanization of the community in which the patients reside, although one study in Taiwan, undertaken by Wu et al.20 did find that almost half of rural families and

two-thirds of urban families had, at some time, used CAM. One possible reason for the lower incidences of visits to TCM practitioners in rural areas may simply be the barriers to accessibility, given the low density of TCM practitioners in such areas; indeed, there is a significant geographical imbal-ance in the distribution of TCM clinics in Taiwan, since they are more likely to be concentrated in metropolitan and sub-urban areas than rural areas. Therefore, those residing in the lower urbanization levels simply have fewer opportunities to visit TCM clinics.

This study suffers from two potential limitations. Firstly, the NHIRD lacks critical data on socio-demographic charac-teristics, such as marital status, educational level and health status, all of which, as noted in several of the prior studies, may influence CAM usage.1,2,21 Secondly, although the

pro-portion of contracted TCM clinics had reached about 93.4% in 2007 (2709 out of the total of 2900 TCM clinics), the remain-ing clinics had still not contracted with the NHI Bureau; thus, the utilization data on these TCM clinics is not included in the NHIRD. Faced with the challenge of the urgent demand for effective methods of treatment, mental healthcare pro-fessionals need to understand the pattern of TCM usage among schizophrenia patients in light of the increasing pop-ularity of TCM usage throughout the population as a whole. Within the context of the above limitations, the results do

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demonstrate some factors associated with TCM usage among schizophrenia patients.

Since a substantial proportion of schizophrenia patients are demonstrating the simultaneous use of TCM and con-ventional treatment, further clinical studies are required to explore both the risks involved in, and the potential effectiveness of, a combination of TCM and conventional psychotropic agents. It should be noted that a potentially dangerous interaction was found in some of the prior stud-ies between pharmacotherapstud-ies used in psychiatric patients and certain forms of CAM.22It is, therefore, vitally important

to determine the clinical impacts of TCM in schizophrenia treatment, based upon empirical evidence, before mental healthcare professionals and policymakers can adopt a prin-cipled policy stance on the use of TCM by schizophrenia patients.

Our study confirms that the age and gender of patients, geographical location, level of urbanization, severity of ill-ness, the number of visits to clinic, the income-related insured amount and the presence of diabetes or hyper-tension all have significant correlations with visits to TCM practitioners. It is hoped that further exploration of the help-seeking behavior of the schizophrenia population may provide appropriate approaches that could ultimately prove to be of significant benefit to the management of this dev-astating mental disorder.

References

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2. Kessler RC, Soukup J, Davis RB, Foster DF, Wilkey SA, Van Rompay MI, et al. The use of complementary and alternative therapies to treat anxiety and depression in the United States. Am J Psychiatry 2001;158(2):289—94.

3. Oldendick R, Coker AL, Wieland D, Raymond JI, Probst JC, Schell BJ, et al. Population-based survey of complementary and alternative medicine usage, patient satisfaction, and physician involvement. South Carolina Complementary Medicine Program Baseline Research Team. South Med J 2000;93(4):375—81. 4. Eisenberg DM, Kessler RC, Foster C, Norlock FE, Calkins

DR, Delbanco TL. Unconventional medicine in the United States. Prevalence, costs, and patterns of use. N Engl J Med 1993;328(4):246—52.

5. Unutzer J, Klap R, Sturm R, Young AS, Marmon T, Shatkin J, et al. Mental disorders and the use of alternative medicine: results from a national survey. Am J Psychiatry 2000;157(11):1851—7.

6. Wu P, Fuller C, Liu X, Lee HC, Fan B, Hoven CW, et al. Use of complementary and alternative medicine among women with depression: results of a national survey. Psychiatr Serv 2007;58(3):349—56.

7. Astin JA. Why patients use alternative medicine: results of a national study. JAMA 1998;279(19):1548—53.

8. Druss BG, Rosenheck RA. Use of practitioner-based comple-mentary therapies by persons reporting mental conditions in the United States. Arch Gen Psychiatry 2000;57(7):708—14. 9. Russinova Z, Wewiorski NJ, Cash D. Use of alternative health

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10. Chen FP, Chen TJ, Kung YY, Chen YC, Chou LF, Chen FJ, et al. Use frequency of traditional Chinese medicine in Taiwan. BMC Health Serv Res 2007;23(7):26.

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13. Eisenberg DM, Kessler RC, Van Rompay MI, Kaptchuk TJ, Wilkey SA, Appel S, et al. Perceptions about complementary ther-apies relative to conventional therther-apies among adults who use both: results from a national survey. Ann Intern Med 2001;135(5):344—51.

14. Riesmann F. Alternative health movements. Soc Policy. Spring 1994:53—7.

15. Chen FP, Kung YY, Chen TJ, Hwang SJ. Demographics and pat-terns of acupuncture use in the Chinese population: the Taiwan experience. J Altern Complement Med 2006;12:379—87. 16. Boutin PD, Buchwald D, Robinson L, Collier AC. Use of and

atti-tudes about alternative and complementary therapies among outpatients and physicians at a municipal hospital. J Altern Complement Med 2000;6(4):335—43.

17. Sturm R. Patient risk-taking attitude and the use of com-plementary and alternative medical services. J Altern Complement Med 2000;6(5):445—8.

18. Eisenberg DM, Davis RB, Ettner SL, Appel S, Wilkey S, Van Rompay M, et al. Trends in alternative medicine use in the United States, 1990—1997: results of a follow-up national sur-vey. JAMA 1998;280(18):1569—75.

19. Burstein HJ, Gelber S, Guadagnoli E, Weeks JC. Use of alterna-tive medicine by women with early stage breast cancer. N Engl J Med 1999;340(22):1733—9.

20. Wu ACC. Many ways to health: a study of 2000 rural and urban Taiwan families. Am J Chin Med 1980;8:313—30.

21. Paramore LC. Use of alternative therapies: estimates from the 1994 Robert Wood Johnson Foundation National Access to Care Survey. J Pain Symptom Manage 1997;13(2):83—9.

22. Yager J, Siegfreid SL, DiMatteo TL. Use of alternative remedies by psychiatric patients: illustrative vignettes and a discussion of the issues. Am J Psychiatry 1999;156(9):1432—8.

數據

Table 1 Descriptive analysis of sampled schizophrenia patients in Taiwan, 2004 a
Table 2 Distribution of the characteristics of sampled schizophrenia patients in Taiwan, by traditional Chinese medicine usage, 2004 a
Table 3 Adjusted multiple logistics regression analysis of relationships between traditional Chinese medicine usage and schizophrenia patient characteristics a

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