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Table 3 Odds ratios of variables associated with sleep disturbance

From: Association between Workplace Risk Factor Exposure and Sleep Disturbance: Analysis of the 2nd Korean Working Conditions Survey

  Model I* Model II† Model III‡
  OR 95% CI OR 95% CI OR 95% CI
Gender (reference [ref]: female)    0.85 0.61 - 1.17 0.77 0.54 - 1.09
Age    1.01 0.99 - 1.02 1.01 0.99 - 1.02
Educational status(ref: Middle school or below)       
 High school    0.73 0.46 - 1.16 0.69 0.42 - 1.12
 College or above    1.17 0.71 - 1.92 0.93 0.51 - 1.69
Drinking frequency (ref: none)       
 ≤1 per week    1.32 0.90 - 1.95 1.26 0.85 - 1.88
 ≥2 per week    1.72 1.14 - 2.61 1.78 1.17 - 2.72
Hypertension (ref: no)    1.28 0.78 - 2.11 1.10 0.65 - 1.85
Obesity (ref: no)    1.60 0.89 - 2.89 1.73 0.93 - 3.21
Depressive symptoms (ref: no)    17.36 11.12 - 27.09 15.16 9.49 - 24.23
Job type (ref: white collar)       
 Service      0.45 0.26 - 0.76
 Blue collar      0.53 0.33 - 0.84
Working time/wk (ref: 40–48 hr)       
 <40      1.21 0.72 - 2.02
 49-60      1.31 0.91 - 1.88
 ≥61      2.32 1.51 - 3.57
Shift work (ref: no)      2.49 1.68 - 3.70
Number of employees (ref: <5)       
 5-49      0.62 0.42 - 0.91
 50-299      1.17 0.76 - 1.81
 ≥300      0.59 0.33 - 1.05
Physical risk exposure (ref: unexposed) 1.70 1.31 - 2.21 1.31 0.94 - 1.83 1.47 1.05 - 2.07
Chemical risk exposure (ref: unexposed) 1.57 1.18 - 2.07 1.00 0.69 - 1.45 1.13 0.77 - 1.64
Biological risk exposure (ref: unexposed) 2.48 1.59 - 3.88 1.67 0.99 - 2.80 1.26 0.72 - 2.21
High job demand (high/low) 3.74 2.88 - 4.86 3.12 2.34 - 4.17 2.93 2.16 - 3.98
Insufficient job control (high/low) 0.84 0.64 - 1.10 0.76 0.57 - 1.02 0.78 0.57 - 1.05
Inadequate social support (high/low) 1.50 1.15 - 1.95 1.52 1.13 - 2.05 1.57 1.14 - 2.15
Job insecurity (high/low) 1.11 0.85 - 1.45 1.04 0.78 - 1.39 1.08 0.80 - 1.46
Lack of reward (high/low) 1.86 1.43 - 2.41 1.46 1.09 - 1.95 1.45 1.08 - 1.96
  1. * Model I: odds ratio by independent univariate logistic regression analysis.
  2. †Model II: multivariate logistic regression analysis, adjusted for general characteristics simultaneously.
  3. ‡Model III: multivariate logistic regression analysis, adjusted for general and occupational characteristics simultaneously.