Stress and sleep quality in doctors working on-call shifts are associated with functional gastrointestinal disorders

Table 6 Risk factors for irritable bowel syndrome in univariate and multivariate analysis

	Univariate analysis			Multivariate analysis
	OR	95%CI	P value	OR	95%CI	P value
Age (yr)	0.92	0.81-1.06	0.239	1.03	0.88-1.20	0.696
Sex (female)	0.54	0.23-1.25	0.151	2.33	1.25-14.00	0.020
BMI (kg/m2)	1.00	0.97-1.01	0.206
Occupational position
Intern	Reference			Reference
Resident	0.99	0.43-2.29	0.977	4.29	1.25-14.73	0.021
Fellow	0.87	0.09-7.63	0.872	2.29	0.95-3.90	0.460
Marriage	1.19	0.45-2.94	0.778
Smoking	0.42	0.05-3.38	0.411
Drinking (≥ 1 d/wk)	0.79	0.58-3.14	0.478
Duration of recent on-call work (mo)	0.92	0.88-2.78	0.125	1.45	0.40-5.26	0.576
Psychosocial alarm
None	Reference			Reference
Present	1.18	0.24-5.80	0.840	1.81	0.44-4.62	0.817
Serious	1.97	0.63-6.17	0.245	1.53	0.42-5.64	0.523
Length of sleep (h)	1.11	0.45-1.17	0.934
Poor sleep quality (PSQI ≥ 6)	3.16	1.04-12.63	0.002	4.17	1.92-19.02	0.016
Working period (yr)	0.72	0.51-1.02	0.601

For the occupational position, the intern is the reference group. For the psychosocial alarm, the absence of psychosocial alarm is the reference group. BMI: Body mass index; PSQI: Pittsburgh Sleep Quality Index; OR: Odds ratio.