| First Births (n = 28026) | Second births (n = 24691) | ||||
---|---|---|---|---|---|---|
Outcomes | Number of babies | Crude estimatea (95% CI) | Adjusted estimatea (95% CI) | Number of babies | Crude estimatea (95% CI) | Adjusted estimatea (95% CI) |
Birthweight in grams | 5316 | -40(-57, -23) | -29(-42, -16)b | 2910 | -78(-103, -53) | -55(-74, -37)b |
Birthweight in term babies | 4969 | -33(-49, -16) | -30(-43, -16)b | 2044 | -71(-95, -48) | -57(-77, -38)b |
SGA | 325 | 1.13(0.99-1.28) | 1.13(0.99-1.28)c | 165 | 1.35(1.13-1.60) | 1.25(1.05-1.48)c |
VSGA | 212 | 1.09(0.94-1.28) | 1.09(0.93-1.27)c | 107 | 1.27(1.03-1.06) | 1.17(0.94-1.45)c |
Preterm birth 33-36 weeks | 240 | 1.07(0.92-1.25) | 1.10(0.95-1.28)c | 106 | 1.43(1.16-1.76) | 1.27(1.03-1.59)c |
Very preterm birth 23-32 weeks | 94 | 1.45(1.14-1.84) | 1.42(1.12-1.81)c | 38 | 1.22(0.84-1.76) | 1.21(0.86-1.71)c |