Low birthweight quintile† |
No | 487 930 | 1.00 | | |
Yes | 119 107 | 1.43 | (1.31 to 1.56) | < 0.001 |
Age group of mother |
<22 | 95 569 | 1.00 | | |
22–25 | 134 480 | 0.94 | (0.83 to 1.08) | 0.38 |
26–28 | 130 828 | 0.95 | (0.84 to 1.09) | 0.48 |
29–31 | 116 748 | 1.18 | (1.03 to 1.34) | < 0.05 |
⩾32 | 129 412 | 1.03 | (0.90 to 1.17) | 0.69 |
Carstairs deprivation category |
1 - Least deprived | 33 087 | 1.00 | | |
2 | 78 781 | 0.89 | (0.74 to 1.07) | 0.22 |
3 | 125 984 | 0.83 | (0.69 to 0.98) | < 0.05 |
4 | 149 913 | 0.82 | (0.69 to 0.97) | < 0.05 |
5 | 97 102 | 0.93 | (0.78 to 1.11) | 0.44 |
6 | 72 010 | 0.73 | (0.60 to 0.89) | < 0.01 |
7 - Most deprived | 50 160 | 0.81 | (0.66 to 0.99) | < 0.05 |
Previous pregnancy with a history of congenital anomaly |
No | 540 815 | 1.00 | | |
Yes | 66 222 | 1.20 | (1.07 to 1.34) | < 0.01 |