• 沒有找到結果。

The present findings suggest that sleep insufficiency may be an independent risk factor for low back pain in both male and female workers. The potential mechanisms behind the effect of sleep insufficiency on low back pain were highly speculative and required further research. In addition, interventional studies should be carried out to evaluate whether improving sleep quantity is effective in preventing or improving LBP.

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Tables

Table 1. Characteristics of study participants

Characteristic Questionnaire (n = 24,509)

P value † 1-3times/month 3,038 (20.6) 1,946 (20.0)

> Once per week 4,499 (30.5) 2,470 (25.4)

Characteristic Men Women Lifting heavy objects 2,575 (17.4) 540 (5.5) <0.0001 Awkward body posture 3,475 (23.5) 2,370 (24.3) 0.153 Lengthy computer use 1,944 (13.1) 2,469 (25.3) <0.0001 Inappropriate desk height 330 (2.2) 407 (4.2) <0.0001

Sleep hr on workday 0.357

† P-value were derived from chi-square test for categorical variables and t

test for continuous variables

Table 2. Factor analysis for ergonomic work exposure factors

Eigen value 2.7219 1.2960 0.9395

Exposure items Factor loading

Inappropriate desk height 0.9669 0.1006 0.2344 Lengthy computer use 0.3529 -0.1034 -0.1764 Vibrating hand tool -0.0454 0.8077 0.2347 Whole body vibration -0.0174 0.5907 0.2192 Lifting heavy objects -0.0995 0.2212 0.8013 Heavy hand tool -0.0528 0.4753 0.6029 Awkward body posture 0.0569 0.1721 0.4952 Factor named Workstation

exposure

Exposure to

vibration Heavy work

% of male workers

exposed 14.3 9.0 32.4

% of female workers

exposed 26.8 1.8 26.6

Table 3. The risk factors of lower back discomfort in male participants

Sleep hr on

workday *** 3.0

Sleep hr > 7 684/6903 (9.9) 1 1 1

6 < Sleep hr ≤ 7 572/5243 (10.9) 1.1 (1.0-1.3) 1.0 (0.9-1.2) 1.0 (1.0-1.1) Sleep hr ≤ 6 395/2626 (15.0) 1.6 (1.4-1.8)*** 1.4 (1.2-1.6)*** 1.1 (1.1-1.2)**

Sleep hr on

holiday*** 3.1

Sleep hr > 8 530/5234 (10.1) 1 1 1

7 < Sleep hr ≤ 8 616/5989 (10.3) 1.0 (0.9-1.2) 1.0 (0.9-1.1) 1.0 (1.0-1.1) Sleep hr ≤ 7 505/3549 (14.2) 1.5 (1.3-1.7)*** 1.3 (1.1-1.5)** 1.1 (1.0-1.2)**

aOR = Adjusted odds ratio using backward stepwise logistic regression aRR = Adjusted relative risk using generalized linear model

adjusted AR = adjusted attributable risk MSD : musculoskeletal discomfort

*P < 0.05

**P < 0.01

***P < 0.0001

Table 4. The risk factors of lower back discomfort in female participants

Sleep hr on

workday *** 11.9

Sleep hr > 7 382/4644 (8.2) 1 1 1

6 < Sleep hr ≤ 7 406/3389 (12.0) 1.5 (1.3-1.8)*** 1.4 (1.2-1.7)*** 1.2 (1.1-1.3)***

Sleep hr ≤ 6 284/1704 (16.7) 2.2 (1.9-2.6)*** 1.9 (1.6-2.3)*** 1.3 (1.2-1.4)***

Sleep hr on holiday*** - -

Sleep hr > 8 377/3812 (9.9) 1 - -

7 < Sleep hr ≤ 8 411/3908 (10.5) 1.1 (0.9-1.2) - - Sleep hr ≤ 7 284/2017 (14.1) 1.5 (1.3-1.8)*** - - aOR = Adjusted odds ratio using backward stepwise logistic regression

aRR = Adjusted relative risk using generalized linear model adjusted AR = adjusted attributable risk

MSD : musculoskeletal discomfort

*P < 0.05

**P < 0.01

***P < 0.0001

Figures Figure 1. Study enrollment.

Workers approached

28,716

Eligible and enrolled

24,509 Questionnaire

survey 24,996

Ineligible or incomplete data

487 Refusal or unreachable

3,720

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