| Study group Mean ± SD | Placebo group Mean ± SD | Mean difference | T value | P value | 95% C. I | |
Lower | Upper | ||||||
Age | 29.4 ± 7.2 | 32.9 ± 6.1 | −3.53 | −2.89 | 0.115 | −5.95 | −1.11 |
Parity | 4.8 ± 3.5 | 4.5 ± 2.9 | 0.31 | 0.53 | 0.594 | −0.85 | 1.48 |
EGA | 7.1 ± 1.9 | 6.6 ± 1.9 | 0.48 | 1.41 | 0.163 | −0.98 | 1.16 |
Social class | 3.8 ± 0.7 | 3.8 ± 0.6 | 0.01 | 0.13 | 0.898 | −0.24 | 0.27 |