Table 3.

Factors associated with IBS in human medicine students, in simple and multiple regression analysis.

Characteristics	Irritable Bowel Syndrome
	Simple regression			Multiple regression
	RP	95% CI	p*	RP	95% CI	p*
Age (years)*	0.88	0.79–0.97	0.015	0.91	0.83–0.99	0.028
Sex
Female	Ref.			Ref.
Male	0.52	0.34–0.81	0.004	0.85	0.61–1.18	0.335
Frequent alcohol consumption
No	Ref.
Yes	1.32	0.45–3.90	0.608
Frequent tobacco use
No	Ref.
Yes	1.06	0.21–5.38	0.940
Exhaustion from career activities
Never/almost never	Ref.
Sometimes	1.35	0.33–5.46	0.676
Almost always/always	1.23	0.33–4.51	0.757
Regular exercise
No	Ref.
Yes	1.26	0.90–1.76	0.185
Parents’ condition
Living together	Ref.
Single	1.25	0.86–1.82	0.245
Family member diagnosed with IBS
No	Ref.
Yes	1.40	0.72–2.71	0.317
Current housing
Parents’ house	Ref.
Own house	0.49	0.17–1.39	0.179
Apartment rental	0.98	0.44–2.16	0.952
Depression
No	Ref.
Yes	6.30	2.59–15.33	<0.001	3.63	1.26–10.49	0.017
Anxiety
No	Ref.
Yes	4.07	1.63–10.13	0.003	1.59	0.71–3.57	0.264
Stress
No	Ref.
Yes	1.95	0.78–4.86	0.154
BMI (Body Mass Index)
Normal	Ref.
Overweight	0.68	0.31–1.49	0.336
Obesity	0.37	0.06–2.35	0.295
Hours of sleep
<8 h/day	Ref.
≥8 h/day	0.67	0.35–1.35	0.229
Eating behavior disorder
No	Ref.
Yes	2.32	1.70–3.18	<0.001	1.57	1.01–2.43	0.044

*P values obtained with Generalized Linear Models (GLM), Poisson family, log link function, robust variance, cluster by academic year.