Results from the meta-regression model assessing the impact of exposure time
| Exposure time | Log OR | SE | 95% CI | P value |
| Intercept (1–30 days) | 0.96 | 0.09 | (0.78 to 1.14) | <0.001 |
| Coefficient (>30 days) | −0.75 | 0.12 | (−0.99 to to 0.52) | <0.001 |
The heterogeneity variance is τ 2=0.02.