Table 2

ORs of sleep disorder by shift type

Shift workSleep disordersModel 1Model 2Model 3
N/N%OR (95% CI)P valueOR (95% CI)P valueOR (95% CI)P value
Fixed day shift21/12716.541.001.001.00
Two shifts32/8736.78*2.94 (1.55 to 5.57)0.0013.10 (1.58 to 6.08)0.0013.11 (1.57 to 6.19)0.001
Three shifts22/6434.38*2.65 (1.32 to 5.31)0.0062.86 (1.39 to 5.89)0.0042.87 (1.38 to 5.98)0.005
Four shifts40/13529.63*2.13 (1.176 to 3.86)0.0132.23 (1.19 to 4.18)0.0122.22 (1.17 to 4.18)0.014
Others9/2240.91*3.50 (1.32 to 9.22)0.0113.74 (1.33 to 10.51)0.0123.88 (1.36 to 11.08)0.011
  • Model 1: unadjusted.

  • Model 2: adjusted for gender, age, ethnicity, education, marital status, monthly income, type of work, and length of service.

  • Model 3: additionally adjusted for smoking status, alcohol consumption and physical exercise with the covariates in model 2.

  • *There was no significant difference between groups marked with the same letter.