SF-12 general health questionnaire scores by patient group.
| SF-12 | IBS according to Rome II criteria group 1 (n = 341) | Diagnosis of IBS (some symptoms but not Rome II) group 2 (n = 109) | No IBS group 3 (n = 3607) | Kruskal–Wallis test |
|---|---|---|---|---|
| PCS12 | ||||
| Median (IQR) | 42.4 (30.8–53.1) | 48.4 (38.6–54.8) | 52.5 (43.4–55.9) | P<0.0001 |
| MCS12 | ||||
| Median (IQR) | 41.7 (32.5–51.3) | 49.9 (35.9–55.4) | 52.6 (44.2–57.2) | P<0.0001 |
All paired comparisons (Bonferroni corrected) are significantly different: group 1 versus group 2: PCS12 P<0.01, MCS12 P<0.001; group 1 versus group 3: PCS12 and MCS12 P<0.0001; group 2 versus group 3: PCS12 and MCS12 P<0.0001. IQR = interquartile range; IBS = irritable bowel syndrome; SF-12 = 12-item short-form health survey; PCS12 = 12-item physical component summary; MCS12 = 12-item mental component summary.