Table 6.
Meta-regression of study- and subject-related factors on intestinal transit time
| Variable | Unit of measure | Intercept | Point estimate | Explained variance (%) | P value |
| Constipation/IBS-C | 1 = Yes; 0 = No | 0.218 | 0.352 | 38 | < 0.01 |
| Jadad score | Per 1 unit | -0.117 | 0.141 | 31 | 0.01 |
| Age | Per 1 yr | -0.352 | 0.021 | 27 | 0.02 |
| Female gender proportion | Per 10% | -0.045 | 0.055 | 26 | 0.02 |
| Number of probiotic strains | Per 1 strain | 0.618 | -0.133 | 20 | < 0.05 |
| Body mass index1 | Per 1 kg/m2 | -0.526 | 0.037 | 22 | 0.08 |
| Treatment duration | Per 1 d | 0.392 | -0.004 | 0 | 0.96 |
| Daily probiotic dosage | Per 10 × 109 CFU | 0.385 | -0.001 | 0 | 0.98 |
1
Body mass index not reported for 5 treatment effects. Variables sorted from greatest to least explained variance.