Number (%)* of cases | Number (%)* of controls | OR (95% CI) | |
---|---|---|---|
n=30 | n=757 | ||
Maternal factors | |||
Maternal age (years) | |||
<35 | 24 (80) | 596 (79) | 1 |
35+ | 6 (20) | 160 (21) | 1.09 (0.46 to 2.57) |
Ethnic group | |||
White | 21 (70) | 598 (79) | 1 |
Non-white | 9 (30) | 156 (21) | 1.83 (0.84 to 3.96) |
Socioeconomic status | |||
Managerial | 8 (27) | 189 (26) | 1 |
Other employed/unemployed | 22 (73) | 548 (74) | 0.99 (0.44 to 2.25) |
Marital status | |||
Married/cohabiting | 25 (83) | 630 (84) | 1 |
Single | 5 (17) | 124 (16) | 0.98 (0.37 to 2.59) |
Smoking status during pregnancy | |||
Did not smoke | 26 (87) | 581 (77) | 1 |
Smoked | 4 (13) | 173 (23) | 0.52 (0.18 to 1.50) |
Parity | |||
0 | 12 (40) | 330 (44) | 1 |
1+ | 18 (60) | 427 (56) | 1.16 (0.55 to 2.44) |
Body mass index | |||
Normal or overweight (<30) | 18 (64) | 564 (77) | 1 |
Obese (≥30) | 10 (36) | 170 (23) | 1.84 (0.83 to 4.07) |
Multiple pregnancy | |||
Yes | 1 (3) | 8 (1) | 1 |
No | 29 (97) | 746 (99) | 3.21 (0.07 to 25.31) |
Pre-existing medical conditions | |||
Yes | 11 (37) | 242 (32) | 1.22 (0.57 to 2.60) |
No | 19 (63) | 510 (68) | 1 |
Previous pregnancy complications | |||
Yes | 8 (27) | 148 (20) | 1.49 (0.65 to 3.42) |
No | 22 (73) | 607 (80) | 1 |
*Percentage of individuals with complete data.