Group A | Group B | ||||||
Primiparous | Multiparous | Primiparous | Multiparous | ||||
Study* | Control | Study* | Control | Study* | Control | Study* | Control |
n = 240 | n = 3781 | n = 375 | n = 1798 | n = 143 | n = 557 | n = 160 | n = 278 |
Ma ± SD 28.3 ± 5.1 | Ma ± SD 30.6 ± 4.1 | Ma ± SD 30.6 ± 4.1 | Ma ± SD 32.4 ± 4.3 | Ma ± SD 30.3 ± 4.6 | Ma ± SD 31.7 ± 3.9 | Ma ± SD 32.8 ± 5.0 | Ma ± SD 33.4 ±4.3 |