Table 2 Outcomes of the included studies
Study | N | Mean (SD) pregnancy duration (weeks) | Live birth events n (total n) | ||||
|---|---|---|---|---|---|---|---|
Intervention | Control | Intervention | Control | RR [95% CI] | p-value | ||
Ahmadi et al. (2019) | 78 | 39.1 (2.1) | 38.3 (2.6) | 33 (38) | 18 (40) | 1.93 [1.34, 2.78] |  < 0.001 |
Jafarzadeh et al. (2019) | 94 | Not reported | Not reported | 38 (44) | 21 (50) | 2.06 [1.45, 2.91] |  < 0.001 |
Mahmoud et al. (2004) | 15 | Not reported | Not reported | 5 (7) | 6 (8) | 0.95 [0.51, 1.76] | 0.877 |
Moraru et al. (2012) | 24 | Not reported | Not reported | 19 (20) | 2 (4) | 1.90 [0.71, 5.09] | 0.202 |
Perricone et al. (2008) | 24 | 37.5 (0.9) | 37.2 (2.49) | 12 (12) | 9 (12) | 1.32 [0.93, 1.86] | 0.122 |
Ramos-Medina et al. (2014) | 121 | Not reported | Not reported | 79 (82) | 12 (39) | 3.13 [1.95, 5.02] |  < 0.001 |
Stricker et al. (2005) | 64 | Not reported | Not reported | 38 (44) | 2 (20) | 8.64 [2.31, 32.33] | 0.001 |
Winger et al. (2008) | 58 | 37.2 (3.6) | 38.8 (1.0) | 20 (37) | 4 (21) | 2.84 [1.12, 7.20] | 0.028 |