Table 2 Associations between mothers' characteristics and IM in the child
| Â | Â | Number and % of each group of children | Chi sq (df) with p value below) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Â | Â | IM all ages | IM 11+ | No IM | All IM (vs no IM) | IM aged 11+ (vs no IM) | |||
| Â | Â | No. | % | No. | % | No. | % | Â | Â |
Maternal IM | no | 222 | 98.7 | 154 | 98.7 | 243831 | 98.2 | 0.3(1) | 0.3(1) |
| Â | yes | 3 | 1.3 | 2 | 1.3 | 4554 | 1.8 | 0.6 | 0.6 |
Maternal age | 14-24 | 88 | 39.1 | 66 | 42.3 | 86456 | 34.8 | 2.4(1†) | 4.4(1†) |
| Â | 25-34 | 124 | 55.1 | 82 | 52.6 | 142815 | 57.6 | 0.1 | 0.04 |
| Â | 35+ | 13 | 5.8 | 8 | 5.1 | 18839 | 7.6 | Â | Â |
Maternal social class | 1,2 (higher) | 53 | 28.3 | 40 | 28.8 | 68191 | 35.8 | 5.6*(1†) | 3.5(1†) |
| Â | 3 | 90 | 48.1 | 67 | 48.2 | 86779 | 45.6 | 0.02 | 0.06 |
| Â | 4,5 (lower) | 44 | 23.5 | 32 | 23 | 35466 | 18.6 | Â | Â |
Maternal marital status | not married | 6 | 2.7 | 4 | 2.6 | 23933 | 9.7 | 12.6*(1) | 9.0*(1) |
| Â | married | 219 | 97.3 | 152 | 97.4 | 224042 | 90.4 | 0.0004 | 0.003 |
Maternal smoking | no | 72 | 72 | 47 | 71.2 | 110889 | 76.4 | 1.1(1) | 1(1) |
| Â | yes | 28 | 28 | 19 | 28.8 | 34217 | 23.6 | 0.3 | 0.3 |
Parity | 0 | 87 | 38.7 | 61 | 39.1 | 104123 | 42 | 1(1) | 0.5(1) |
| Â | 1 or more | 138 | 61.3 | 95 | 60.9 | 144076 | 58.1 | 0.3 | 0.5 |
Maternal blood group | A | 93 | 50.3 | 64 | 47.8 | 100917 | 48.9 | 0.1(1) | 0.07(1) |
| Â | O | 92 | 49.7 | 70 | 52.2 | 105299 | 51.1 | 0.7 | 0.8 |
Maternal rhesus status | positive | 171 | 82.2 | 123 | 82.6 | 196481 | 83.2 | 0.1(1) | 0(1) |
| Â | negative | 37 | 17.8 | 26 | 17.5 | 39768 | 16.8 | 0.7 | 0.8 |