Table 5.

Predictors of reporting IBS vs. non-IBS, adjusting for age, gender, educational level, marital status, smoking, alcohol use, and body mass index

	Odds ratio (95% CI)	P value
SSC score (per unit)	2.2 (1.2–3.8)	<0.001
Headache	1.69 (1.25, 2.28)	<0.001
Backache	1.39 (1.07, 1.81)	0.002
Asthma	1.18 (0.76, 1.84)	0.45
Insomnia	1.57 (1.20, 2.05)	<0.001
High blood pressure	1.10 (0.53, 2.26)	0.80
Fatigue	2.06 (1.55, 2.74)	<0.001
General stiffness	1.50 (1.13, 2.00)	0.005
Heart palpitations	1.64 (1.02, 2.62)	0.04
Eye pain	1.59 (1.10, 2.30)	0.01
Dizziness	1.37 (0.94, 1.98)	0.10
Weakness	1.43 (0.99, 2.07)	0.06
SCL-90-R (per unit)
Global Severity Index	1.09 (1.05, 1.13)	<0.001
Somatization	1.10 (1.06, 1.15)	<0.001
Obsessive-compulsive	1.08 (1.04, 1.12)	<0.001
Interpersonal sensitivity	1.04 (1.01, 1.07)	0.01
Depression	1.07 (1.04, 1.11)	<0.001
Anxiety	1.06 (1.03, 1.10)	<0.001
Hostility	1.05 (1.01, 1.09)	0.01
Phobic anxiety	1.05 (1.00, 1.10)	0.07
Paranoid ideation	1.06 (1.02, 1.100	0.001
Psychoticism	1.08 (1.04, 1.12)	<0.001

CI, confidence interval; IBS, irritable bowel syndrome; SCL-90-R, Symptom Checklist-90-R; SSC, Somatic Symptom Checklist.