Subgroup title | No of trials | No of participants | Risk ratio (95% CI) | P Value | I2 (%) |
---|---|---|---|---|---|
Overall | 8 | 33,340 | 1.04 (0.88–1.15) | 0.95 | 0 |
Daily dose | Â | Â | Â | Â | Â |
 Low dose | 1 | 444 | 0.71 (0.03–17.41) | 0.84 |  |
 Medium dose | 2 | 26,941 | 1.00 (0.87–1.14) | 0.99 | 0 |
 High dose | 5 | 5955 | 1.16 (0.53–2.54) | 0.71 | 0 |
Duration | Â | Â | Â | Â | Â |
 Less than 1 year | 4 | 1844 | 0.70 (0.16–2.98) | 0.63 | 0 |
 At least 1 year | 4 | 31,496 | 1.01 (0.88–1.15) | 0.91 | 0 |