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Table 3 Multivariate analysis using the generalized estimating equation for abdominal obesity stratified by ages a

From: Effects of shift work on abdominal obesity among 20–39-year-old female nurses: a 5-year retrospective longitudinal study

  20–29 years old 30–39 years old
  OR 95% CI OR 95% CI
Work schedule
 Day work 1.0   1.0  
 Shift work 3.21* 1.29–7.98 1.46 0.78–2.74
Follow-up period (year) 1.40† 1.23–1.58 1.60† 1.36–1.87
Exercise
 Basic 1.0   1.0  
 Insufficient 0.42* 0.18–0.98 0.33* 0.14–0.78
 Sufficient 1.04 0.64–1.69 0.77 0.49–1.21
  1. *p < 0.05, †p < 0.001
  2. a Adjusted for work schedule, follow-up period and exercise selected by using backward selection
  3. * Abbreviations: OR odds ratio, CI confidence interval