Table 5.

Multivariate logistic regression for abdominal pain

Effect	Odds ratio	95% Confidence interval
Shift (rotating vs. day)	2.80	1.35 –5.80
Shift (night vs. day)	0.97	0.56 –1.69
“Generally I sleep badly” (yes vs. no)	2.00	1.09 –3.64
“I feel sleepy during the day and struggle to remain alert” (yes vs. no)	1.85	1.08 –3.17
“I have difficulty falling asleep” (yes vs. no)	2.18	1.28 –3.70
Age (per 1 year increment)	0.94	0.92 –0.96
Gender (male vs. female)	0.59	0.28 –1.23