Table 2 The effect of maternal age on BW in two-piece wise linear regression model
Turning point of maternal age | Maternal age | Adjusted β/OR (95%CI)a | P value |
|---|---|---|---|
Birth weight | |||
24y,34y | 20 ≤ and < 24 y | 16.204 (14.323, 18.086) | < 0.001 |
24 ≤ and ≤ 34 y | 12.051 (11.609, 12.493) | < 0.001 | |
34 < and ≤ 40 y | -0.824 (-3.112, 1.464) | 0.480 | |
Low birth weight | |||
27y,36y | 20 ≤ and < 27 y | 0.917 (0.903, 0.932) | < 0.001 |
27 ≤ and ≤ 36 y | 0.965 (0.955, 0.976) | < 0.001 | |
36 < and ≤ 40 y | 1.133 (1.026, 1.250) | 0.013 | |
Macrosomia | |||
24y,33y | 20 ≤ and < 24 y | 1.102 (1.075, 1.129) | < 0.001 |
24 ≤ and ≤ 33 y | 1.065 (1.060, 1.071) | < 0.001 | |
33 < and ≤ 40 y | 1.029 (1.012, 1.046) | 0.001 | |