Table 1 Basic demographic data of each group
Group | N | maternal age (years) | gestational age (days) | maternal weight (kg) |
|---|---|---|---|---|
Non-AMA | 197,101 | 28.41(21.54 ~ 34.43) | 118.00(108.00 ~ 134.00) | 54.50(43.00 ~ 74.60) |
AMA | 12,739 | 36.87(35.05 ~ 42.39) | 118.00(109.00 ~ 134.00) | 57.50(45.00 ~ 76.50) |
z | 189.464 | 4.883 | 2.261 | |
P | < 0.001 | < 0.001 | < 0.001 |