Multiple logistic regression of predictors of postinfectious irritable bowel syndrome at each time point
| OR (95% CI) | ||||
| Variable | 2002/2003 | 2004 | 2006 | 2008 |
| Age | −0.99 (−0.98 to −0.99) | NS | 0.97 (0.96 to 0.98) | 0.97 (0.96 to 0.99) |
| Female gender | 1.47 (1.12 to 1.93) | 1.84 (1.30 to 2.59) | 1.71 (1.12 to 2.60) | 2.25 (1.35 to 3.75) |
| Prior anxiety/depression | NS | NS | NS | 2.05 (1.13 to 3.72) |
| Features of acute illness | ||||
| Abdominal cramps | 4.34 (2.13 to 8.82) | 6.06 (2.14 to 16.67) | NS | NS |
| Fever | NS | NS | NS | 1.66 (1.02 to 2.71) |
| Weight loss | 1.82 (1.33 to 2.50) | 2.39 (1.65 to 3.45) | 2.180 (1.36 to 3.48) | 1.67 (0.96 to 2.92) |
| Blood in stools | 1.66 (1.23 to 2.25) | NS | NS | NS |
| Duration of diarrhoea | ||||
| <2 days (reference) | 1.0 | 1.0 | 1.0 | 1.0 |
| 2–3 days | 1.34 (0.67 to 2.70) | 1.98 (0.79 to 4.96) | 2.37 (0.53 to 10.66) | NS |
| 4–5 days | 1.72 (0.84 to 3.50) | 2.45 (0.96 to 6.27) | 3.28 (0.72 to 15.04) | NS |
| 6–7 days | 1.51 (0.74 to 3.08) | 3.03 (1.20 to 7.70) | 5.00 (1.09 to 22.84) | NS. |
| >7 days | 2.37 (1.20 to 4.69) | 3.66 (1.50 to 8.96) | 4.97 (1.13 to 21.94) | NS |
| Peak stool frequency | ||||
| 1–3/day (reference) | 1.0 | 1.0 | 1.0 | 1.0 |
| 4–6/day | NS | NS | 2.48 (1.14 to 5.42) | NS |
| 7–10/day | NS | NS | 2.26 (1.00 to 5.09) | NS |
| >10/day | NS | NS | 2.46 (1.09 to 5.52) | NS |
Only variables with significant univariate association at each time point were assessed in the multivariable logistic regression.
NS, non-significant.