. 2008 Jun 30;137(1):147–155. doi: 10.1016/j.pain.2007.08.029

Table 3.

Additive effects of psychosocial risk markers in the onset of IBS

Number of factors^b	Group size	New IBS		OR^a	95% CI
Number of factors^b	Group size	n	%	OR^a	95% CI
0	534	1	1.2	1.0	–
1	70	16	18.6	1.0
2	637	25	29.0	2.59	1.4–4.9
3	402	27	31.4	4.43	2.4–8.3
4	182	17	19.8	6.33	3.1–13.0

All values are adjusted for age, gender and baseline abdominal pain status.

Scoring in the highest third of the HAD Anxiety Scale and Estimated Sleep Problems Scale and in the highest two-thirds of the Somatic Symptoms Checklist and Illness Behaviour Scale.