Table 1.

Descriptive characteristics of male shift worker study participants according to work shift status

CovariateDay shiftNight shift
N%aN%a
Age group, yb
 20–2520132513
 26–3032205530
 31–3524152513
 36–4031203720
 41–451912137
 46–50149158
 51–551811158
BMI [wt (kg)/ht (m)2]
 <181100
 18–2565416736
 25–30915711261
 >301163
Alcohol consumptionc
 Any45287339
 Number of drinks
  01137111462
  117111810
  2159179
  3 or more1383619
Tobacco use (any)c
 Any1382011
 By type
  Cigarettes961820
  Patch2110
  Other tobacco3221
Medication use (anyc)
 Psychotheraputics14995
 Sedatives1142
 Beta blockers0042
 Thyroid medications0011
 Steroids1111
  • aPercentage calculated from 158 day shift participants and 185 night shift participants.

  • bCalculated according to date of first urine collection.

  • cIn the 24 hours ending the nighttime sleep period