Table 2.
The mediating effect analysis of gestational week on the association between maternal age and birth weight
| Group | Effect value |
95% CI | z /t | p | |
|---|---|---|---|---|---|
| Lower | Upper | ||||
|
Maternal age = > Gestational weeks = > Birth weight (Indirect effect) |
-7.368 | -0.073 | -0.050 | -1495.391 | < 0.001 |
| Maternal age = > Gestational weeks | -0.041 | -0.047 | -0.036 | -13.931 | < 0.001 |
| Gestational weeks = > Birth weight | 177.986 | 174.156 | 181.815 | 91.099 | < 0.001 |
|
Maternal age = > Birth weight (Direct effect) |
8.346 | 6.901 | 9.790 | 11.323 | < 0.001 |
|
Maternal age = > Birth weight (Total effect) |
0.977 | -0.794 | 2.748 | 1.081 | 0.280 |