Table 4 Sensitivity and stratified analyses of pooled odds ratio for case–control studies
|  | Ulcerative colitis | Crohn’s disease | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Â | Stratified analysis | Meta-regression | Stratified analysis | Meta-regression | ||||||||||
| Â | No. of studies | No. of cases | No. of controls | Pooled OR (95%CI) | Heterogeneity (p-value) | Coef. | P value | No. of studies | No. of cases | No. of controls | Pooled OR (95%CI) | Heterogeneity (p-value) | Coef. | P value |
Crude | 7 | 1491 | 3153 | 1.06 (0.78, 1.45) | .004 | Â | Â | 9 | 2028 | 1002618 | 1.26 (1.03, 1.53) | .16 | Â | Â |
Time of exposure | ||||||||||||||
Time of data collection | 4 | 1013 | 2511 | 1.18 (0.78, 1.80) | .006 | -0.32 | .42 | 2 | 474 | 1511 | 1.21 (0.58, 2.50) | .18 | 0.060 | .89 |
Childhood | 3 | 478 | 642 | 0.87 (0.65, 1.17) | .91 | Â | Â | 5 | 1028 | 999115 | 1.18 (0.82, 1.70) | .052 | Â | Â |
0-6 years |  |  |  |  |  |  |  | 4 | 832 | 998908 | 1.12 (0.71, 1.77) | .026 | 0.16 | .46 |
< 16 years |  |  |  |  |  |  |  | 1 | 196 | 207 | 1.39 (0.74, 2.60) | NA |  |  |
Source of controls | ||||||||||||||
Population | 2 | 314 | 487 | 1.02 (0.66, 1.58) | .16 | 0.035 | .94 | 3 | 835 | 998893 | 1.40 (1.13, 1.73) | .37 | -0.23 | .32 |
Clinic/Hospital | 5 | 1177 | 2666 | 1.06 (0.70, 1.60) | .003 | Â | Â | 6 | 1193 | 3725 | 1.09 (0.79, 1.51) | .11 | Â | Â |