(a) Social class
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I | 45 | 10.0 | 7.4 to 13.3 | 30 | 9.2 | 6.4 to 13.1 | 15 | 4.1 | 2.5 to 6.9 | 9 | 3.1 | 1.6 to 6.0 |
II | 165 | 10.4 | 8.9 to 12.1 | 88 | 8.6 | 7.0 to 10.6 | 57 | 5.7 | 4.4 to 7.4 | 27 | 3.2 | 2.2 to 4.7 |
IIIn | 140 | 13.9 | 11.7 to 16.4 | 37 | 6.9 | 5.0 to 9.5 | 35 | 8.2 | 5.9 to 11.4 | 17 | 5.9 | 3.7 to 9.5 |
IIIm | 644 | 13.4 | 12.4 to 14.5 | 291 | 10.2 | 9.1 to 11.4 | 126 | 6.0 | 5.0 to 7.1 | 53 | 3.2 | 2.4 to 4.2 |
IV | 311 | 14.3 | 12.8 to 15.9 | 103 | 10.2 | 8.4 to 12.4 | 54 | 6.7 | 5.1 to 8.7 | 18 | 2.6 | 1.6 to 4.1 |
V | 203 | 17.4 | 15.2 to 20.0 | 68 | 13.4 | 10.6 to 17.0 | 26 | 5.9 | 4.0 to 8.7 | 14 | 3.8 | 2.2 to 6.4 |
Armed forces and unknown | 51 | 14.7 | 11.2 to 19.4 | 13 | 13.0 | 7.5 to 22.3 | 2 | 4.3 | 1.1 to 17.3 | 2 | 6.0 | 1.5 to 23.9 |
Father unrecorded | 88 | 30.0 | 24.4 to 37.0 | 63 | 28.1 | 22.0 to 36.0 | 29 | 12.1 | 8.4 to 17.5 | 11 | 3.2 | 1.8 to 5.7 |
p for trend across social classes I–V | <0.001 | | | <0.001 | | | >0.05 | | | >0.05 | | |
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(b) Deprivation quintile
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Townsend score | | | | | | | | | | | | |
1 (low) | – | – | – | 113 | 8.6 | 7.1 to 10.3 | 67 | 6.2 | 4.9 to 7.8 | 37 | 4.1 | 3.0 to 5.7 |
2 | – | – | – | 118 | 9.0 | 7.5 to 10.7 | 66 | 6.1 | 4.8 to 7.7 | 35 | 3.9 | 2.8 to 5.4 |
3 | – | – | – | 131 | 9.9 | 8.4 to 11.8 | 70 | 6.5 | 5.1 to 8.2 | 27 | 3.0 | 2.1 to 4.4 |
4 | – | – | – | 140 | 10.6 | 9.0 to 12.5 | 65 | 6.0 | 4.7 to 7.6 | 30 | 3.3 | 2.3 to 4.8 |
5 (high) | – | – | – | 191 | 14.5 | 12.6 to 16.7 | 76 | 7.0 | 5.6 to 8.8 | 22 | 2.4 | 1.6 to 3.7 |
All births | 1647 | 13.9 | 13.3 to 14.6 | 693 | 10.5 | 9.8 to 11.3 | 344 | 6.3 | 5.7 to 7.0 | 151 | 3.3 | 2.9 to 3.9 |