Table 1. Prevalence of risk factors and outcomes in low and high risk cohorts.
| LOW RISK Deprivation quintile | 1 | 2 | 3 | 4 | 5 | All | p for trend |
| N | 655 | 1543 | 4169 | 4930 | 20469 | 31766 | |
| age<18 | 1 (0.2) | 7 (0.5) | 17 (0.4) | 36 (0.7) | 358 (1.7) | 419 (1.3) | 0.220 |
| age>30 | 526 (80.3) | 1186 (76.9) | 2880 (69.1) | 2957 (60) | 7871 (38.5) | 15420 (48.5) | 0.000 |
| White | 604 (92.2) | 1438 (93.2) | 3788 (90.9) | 4369 (88.6) | 17322 (84.6) | 27521 (86.6) | 0.000 |
| Underweight | 4 (0.7) | 20 (1.6) | 82 (2.3) | 72 (1.7) | 600 (3.5) | 778 (2.9) | 0.000 |
| Obese | 61 (11) | 149 (11.8) | 440 (12.6) | 574 (13.8) | 2939 (16.9) | 4163 (15.5) | 0.000 |
| Smoker | 37 (5.6) | 122 (7.9) | 460 (11) | 794 (16.1) | 7009 (34.2) | 8422 (26.5) | 0.000 |
| Smoker<10 | 32 (4.9) | 101 (6.6) | 380 (9.2) | 613 (12.5) | 5256 (25.8) | 6382 (20.2) | 0.000 |
| Smoker>10 | 5 (0.8) | 21 (1.4) | 80 (1.9) | 181 (3.7) | 1753 (8.6) | 2040 (6.5) | 0.000 |
| Previous smoker | 50 (7.7) | 139 (9.1) | 460 (11.1) | 545 (11.1) | 2272 (11.2) | 3466 (11) | 0.005 |
| Nulliparous | 350 (53.7) | 859 (55.9) | 2443 (58.8) | 2956 (60.3) | 11659 (57.2) | 18267 (57.7) | 0.817 |
| Caesarean section | 162 (24.7) | 379 (24.6) | 991 (23.8) | 1110 (22.5) | 3939 (19.2) | 6581 (20.7) | 0.000 |
| Preterm<34 | 10 (1.5) | 15 (1) | 47 (1.1) | 61 (1.2) | 331 (1.6) | 464 (1.5) | 0.006 |
| Preterm 34 to 37 | 17 (2.6) | 30 (1.9) | 129 (3.1) | 157 (3.2) | 815 (4) | 1148 (3.6) | 0.000 |
| Preterm<37 | 27 (4.1) | 45 (2.9) | 176 (4.2) | 218 (4.4) | 1146 (5.6) | 1612 (5.1) | 0.000 |
| Deaths in preterm<34 | 0 | 0 | 3 (8.5) | 5 (8.2) | 16 (4.8) | 24 (5.2) | 0.836 |