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The effects of gender and parental factors on the relationship of eating disorder symptoms and co-occurring psychiatric symptoms

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Abstract

Eating symptoms Differences Yes n = 541 No n = 4474 n (%) or Mean ± SD n (%) or Mean ± SD

Age (in years) 18.6 ± 1.1 19.1 ± 2.8 F(1, 4997) = 14.93, p < .001

Gender Male 222 (41.1) 2354 (52.8) χ12 = 26.53, p < .0001 Female 318 (58.9) 2101 (47.2) Family APGAR 6.6 ± 3.0 7.0 ± 2.8 F(1, 5008) = 7.51, p = 0.006 Fathers Age(in years) 49.8 ± 4.3 50.3 ± 4.9 F(1, 4641) = 4.68, p = 0.031 Educational level

Senior high or lower 279 (52.6) 2119 (49.1) χ12 = 2.34, p = 0.126

College or higher 251 (47.4) 2195 (50.9) Employment status Professional job 137 (26.3) 1143 (26.7) χ22 = 1.51, p = 0.470 Technical job 296 (56.8) 2335 (54.4) Others 88 (16.9) 811 (18.9) Parenting style

Affectionate and care 22.7 ± 7.3 23.8 ± 7.0 F(1, 4921) = 10.95, p < .001

Protection 10.2 ± 7.0 9.4 ± 6.5 F(1, 4920) = 8.44, p = 0.004

Mothers

Age(in years) 46.9 ± 3.7 47.5 ± 4.3 F(1, 4729) = 9.55, p = 0.002

Educational level

Senior high or lower 336 (63.6) 2769 (63.4) χ12 = 0.01, p = 0.907

College or higher 192 (36.4) 1600 (36.6) Employment status Professional job 46 (8.9) 380 (8.9) χ22 = 0.79, p = 0.674 Technical job 238 (46.1) 1882 (44.2) Others 232 (45.0) 2001 (46.9) Parenting style

Affectionate and care 26.2 ± 6.7 26.8 ± 6.1 F(1, 4997) = 5.16, p = 0.023

Protection 12.7 ± 7.6 11.6 ± 6.7 F(1, 4997) = 11.60, p < .001

Aims: This study aimed to investigate the co-occurring psychiatric symptoms with eating disorders (EDs) and the moderating effects of gender and parental factors on their

relationships in a large sample of college students. Methods: Out of a total of 7531 new entrants, 5015 (participation rate, 66.6%; male: 51.6%) completed the Chinese version of the self-administered Adult Self-Report Inventory-4, Parental Bonding Instrument, and Family APGAR. Individuals with EDs (n = 541) were identified with either anorexia (n = 485) or bulimia (n = 20) alone, or both symptoms (n = 36). Linear regression models were used to test the prediction of EDs, parental educational level,

perceived family support and parenting style to symptoms of other DSM-IV psychiatric disorders and the interactions between ED symptoms and gender or parental factors on the effects of these symptoms. Results: In addition to ED symptoms and lower perceived family support, gender-specific pattern was associated with significantly more severe symptoms of anxiety, obsessive-compulsive (OCD), depressive, and somatoform disorders. Paternal education levels as college and higher were associated with decreased symptom severity of anxiety and somatoform disorder, whereas maternal education levels as college and higher was associated with decreased symptom severity of OCD. Lower levels of care and higher levels of protection from both parents were generally associated with more severe psychiatric symptoms. Regarding the moderating roles of gender and parental factors, our results showed that male gender elevated, and higher paternal education and paternal care decreased the magnitude of relationships between ED symptoms and OCD; higher paternal educational level and paternal care decreased the magnitude of relationships between EDs and depressive symptoms; and higher maternal care level was associated with decreased magnitude of the relationship between ED symptoms and somatoform symptoms. There were no moderating effects from gender and parental factors on anxiety symptoms. Conclusion: This study demonstrated that in addition to their main effects on psychiatric

symptoms, gender and parental factors may have moderating effects on the relationships between the EDs and co-occurring OCD, depressive disorder, and somatoform disorders symptoms. Our findings indicate an important role of parenting styles on the associations between EDs and these co-occurring psychiatric symptoms.

Mei-Chih Meg Tseng

1,2

, Susan Shur-Fen Gau

1

1

Department of Psychiatry, National Taiwan University Hospital, and National Taiwan University College of Medicine, Taipei, 10002, Taiwan

2

Institute of Occupational Medicine and Industrial Hygiene, College of Public Health, National Taiwan University, Taipei 10055, Taiwan

The effects of gender and parental factors on the relationship of

eating disorder symptoms and co-occurring psychiatric symptoms

Background

Eating disorders (EDs) are often characterized with many concomitant emotional/behaviroal symptoms1-2 and less attention was paid on its relationship with somatization

symptoms3. Little is known about the moderating variables on the development of co-occurring emotional/somatization symptoms among EDs subjects. This study aimed to

investigate the co-occurring psychiatric symptoms with EDs and the effect of gender and parental factors on their co-morbid relationships in a large sample of college students in Taiwan.

Methods

Participants

The participants consisted of 5015 first-year college students (male: 51.6%, mean age, 19.0 years; SD = 2.7) recruited from the National Taiwan University (NTU). Out of a total of 7531 new entrants in the two consecutive years (3756 in 2003 and 3775 in 2004), 5015 (participation rate, 66.6%) consented to the study and completed the questionnaires in the first weeks of the fall semesters.

Measures

Adult Self-Report Inventory-4 (ASRI-4)

A 136-item self report or interview scale, is derived from Youth Self-Report Inventory 4 for the purpose of making the DSM-IV referenced psychiatric diagnosis in adults. Two

scoring procedures can be applied: the Symptom Count score (number of DSM-IV-specified symptoms) and the Symptom Severity score (a dimensional scoring). On rating, each item was assigned to one of four responses: 0 = never, 1 = sometimes, 2 = often, 3 = very often. Co-occurring psychiatric disorders were scored as symptoms severity by

summing up the score of each item for a specific disorder. The psychometric properties of the Chinese ASRI-4 were demonstrated to be good.5 Parental Bonding Instrument (PBI)

The PBI is a 25-item instrument (items are rated on a 4-point Likert scale from “very likely” to “very unlikely”) measuring the parents’ behaviors and attitudes toward their child during that child’s first 16 years.6 The PBI consists of two principal dimensions: Care (12 items) and Protection (13 items). The Chinese PBI is a reliable and valid instrument and

has been widely used in Taiwanese studies.7 Chinese version of the Family APGAR

Family APGAR, a 5-item measure, is designed to assess the five dimensions of perceived family support: adaptation, partnership, growth, affection, and resolve. A higher score indicates a more highly functional family.8

Statistical analysis

The comparison groups were the participants with and without EDs. Individuals with EDs (n = 541) consisted of either anorexia (n = 485) or bulimia (n = 20) alone, or both symptoms (n = 36).The categorical variables were compared with the chi-square test and continuous variables were with the analysis of variance (ANOVA) for significance. Linear regression model was used to test the prediction of EDs, parental educational level, perceived family support, and parenting style to symptoms of psychiatric disorders measured by the Chinese ASRI-4. In addition to the main effects, we also examined the interaction terms between EDs and gender, parental educational level, and parenting style on the prediction of co-occurring psychiatric symptoms by stepwise selection method.

Discussion Results

This is one of the few studies to investigate the co-morbid psychiatric disorder symptoms of EDs and the moderating effects of gender and parents on the

relationship of EDs and co-morbid psychiatric disorder symptoms among a school-based sample of young adults. This study corroborates the previous findings that EDs were associated with many co-occurring psychiatric symptoms, and individuals with EDs were at risk for the co-existence of mood disorders, anxiety disorders, OCD, and somatoform disorders.

In addition to their main effects on psychiatric symptoms, gender and parental factors may have moderating effects on the relationships between the EDs and these co-occurring psychiatric symptoms. While paternal care was demonstrated to be

significantly reduced the risk of OCD and depressive disorder symptoms, maternal care was found to be significantly reduced the risk of somatoform disorders for individuals with EDs.

Demographic characteristics of the sample

Table 1 shows characteristics of individuals with and without ED symptoms. Individuals with EDs are younger and female predominance and have poorer family functioning

measured by the APAGA compared to those without EDs. The parental styles show lower affectionate and care and higher protection in both parents of individuals with EDs than those of individuals without EDs.

Co-occurring psychiatric disorder symptoms among individuals with eating disorder symptoms

Individuals with EDs showed significantly more severe symptoms of psychiatric disorders including anxiety disorders, obsessive-compulsive disorder (OCD), tics, depressive disorders, bipolar disorder, somatoform disorders, post-traumatic stress disorder, dissociation, and adjustment disorder (Table 2).

Effects of gender and parental factors on the co-morbid patterns of psychiatric disorder symptoms and eating disorder

ED symptoms and lower perceived family support were associated with more severe symptoms of anxiety disorders, OCD, depressive disorders, and somatoform disorders (Table 3).

For anxiety disorder symptoms, female gender increased the severity of anxiety disorders and paternal education levels as college and higher was associated with decreased symptom severity of anxiety disorders. Lower levels of care and higher protection from both parents were associated with more severe anxiety disorder symptoms. There were no moderating effects from gender and parental factors on anxiety symptoms.

For OCD symptoms, male gender increased the severity of OCD disorders, but maternal education levels as college and higher showed a protective effect for symptom severity of OCD. Lower levels of care from father and higher levels of protection from both parents were associated with more severe symptoms of OCD. Regarding the moderating roles of gender and parental factors, male gender elevated, and paternal education of college and higher and paternal care decreased the magnitude of relationships between ED symptoms and OCD.

Similar to anxiety disorder, female gender and lower levels of care and higher protection from both parents were associated with more severe depressive disorder symptoms. Paternal education of college and higher and paternal care decreased the magnitude of relationships between ED symptoms and depressive disorders.

Main effects of gender, parenting style, and paternal educational level on somatoform disorders were the same as on anxiety disorders. Of note, higher maternal care level was associated with decreased magnitude of the relationship between ED symptoms and co-occurring somatoform symptoms.

Table 1. Demographic characteristics

Table 2. Co-morbid Psychiatric Symptoms with Eating Disorder Symptoms

Psychiatric disorder symptoms Eating Symptoms

Differences Yes n = 541 No n = 4474 Mean ± SD Mean ± SD F p Anxiety Disorders 15.02 ± 6.05 11.56 ± 5.46 189.55 <.0001

Generalized Anxiety Disorder 9.82 ± 3.86 7.81 ± 3.56 150.69 <.0001

Social Phobia 3.07 ± 1.90 2.18 ± 1.69 130.91 <.0001 Specific Phobia 0.85 ± 0.91 0.61 ± 0.75 46.08 <.0001 Agoraphobia 0.54 ± 0.77 0.41 ± 0.64 19.10 <.0001 Panic Disorder 0.73 ± 0.68 0.54 ± 0.61 45.33 <.0001 Obsession-Compulsions 1.55 ± 1.38 1.06 ± 1.15 80.95 <.0001 Tics 1.57 ± 1.39 1.13 ± 1.19 63.49 <.0001 Depressive Disorders 17.75 ± 7.85 13.33 ± 7.06 184.17 <.0001 Major Depression 8.89 ± 4.21 6.66 ± 3.72 168.34 <.0001 Dysthymia 8.86 ± 3.81 6.68 ± 3.45 189.26 <.0001 Bipolar Disorder 6.20 ± 4.57 4.50 ± 3.72 95.93 <.0001 Somatoform Disorders 4.81 ± 2.56 3.47 ± 2.21 171.26 <.0001 Somatization 2.71 ± 1.76 2.16 ± 1.50 63.54 <.0001 Hypochondriasis 0.65 ± 0.78 0.47 ± 0.65 37.24 <.0001 Body dysmorphic 1.44 ± 0.91 0.84 ± 0.75 292.06 <.0001 Post-traumatic Stress 7.94 ± 3.88 6.00 ± 3.43 149.43 <.0001 Dissociation 0.99 ± 1.35 0.62 ± 0.98 62.67 <.0001

Anxiety symptom Obsessive-compulsive

symptoms Depressive symptoms Somatoform symptoms

β (SE) p β (SE) p β (SE) p β (SE) p

Eating symptoms 3.20(0.25) <.001 0.65(0.15) <.001 6.08(0.79) <.001 1.90(0.24) <.001

Gender (male vs. female) -0.47(0.16) .003 0.30(0.04) <.001 -0.47(0.20) .018 -0.16(0.06) .011

APGAR -0.99(0.18) <.001 -0.21(0.04) <.001 -2.09(0.23) <.001 -0.33(0.07) <.001

Paternal education of college and higher -0.73(0.16) <.001 - - - - -0.13(0.06) .049

Maternal education of college and higher - - -0.11(0.05) .017 - - -

-Paternal care -1.33(0.23) <.001 -0.23(0.05) <.001 -1.95(0.31) <.001 -0.62(0.09) <.001

Paternal protection 1.29(0.24) <.001 0.24(0.05) <.001 0.99(0.31) .001 0.38(0.10) <.001

Maternal care -0.98(0.24) <.001 - - -1.35(0.31) <.001 -0.24(0.10) .021

Maternal protection 1.12(0.23) <.001 0.13(0.05) .007 1.74(0.30) <.001 0.20(0.09) .033

Eating symptoms × Gender - - 0.22(0.11) .047 - - -

-Eating symptoms × Paternal education - - -0.29(0.14) .039 -1.28(0.60) .032 -

-Eating symptoms × Paternal care - - -0.32(0.14) .026 -1.72(0.83) .037 -

-Eating symptoms × Maternal care - - - -0.79(0.26) .003

Table 3. Associations between eating disorder symptoms, parenting, family support, and symptoms of anxiety, obsession-compulsion, depression, and somatoform disorders

References

1. Hudson JI, Hiripi E, Pope HG, Jr., & Kessler RC. The prevalence and correlates of eating disorders in the National Comorbidity Survey Replication. Biol Psychiatry 2007; 61: 348-358.

2. Zaider TI, Johnson JG, & Cockell SJ. Psychiatric disorders associated with the onset and persistence of bulimia nervosa and binge eating disorder during adolescence. J Youth Adolesc 2002; 31: 319-329. 3. Johnson JG, Cohen P, Kasen S, & Brook JS. Eating disorders during adolescence and the risk for physical and mental disorders during early adulthood. Arch Gen Psychiatry 2002; 59: 545-552.

4. Gadow KD, Sprafkin J, Carlson GA, Schneider J, Nolan EE, Mattison RE, et al. A DSM-IV-referenced, adolescent self-report rating scale. J Am Acad Child Adolesc Psychiatry 2002; 41: 671-679. 5. Chien YL, Gau SS, & Gadow KD. Gender difference in psychiatric syndromes and psychiatric concurrent patterns in Taiwanese college students. Compr Psychiatry 2010 (in press).

6. Parker G. Parental characteristics in relation to depressive disorders. Br J Psychiatry 1979; 134: 138-147.

7. Gau SS, Shen HY, Chou MC, Tang CS, Chiu YN, & Gau CS. Determinants of adherence to methylphenidate and the impact of poor adherence on maternal and family measures. J Child Adolesc Psychopharmacol 2006; 16: 286-297. 8. Smilkstein G, Ashworth C, & Montano D. Validity and reliability of the family APGAR as a test of family function. J Fam Pract 1982; 15: 303-311.

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