Table 3.
Risk factors for severe maternal morbidity
| Risk factor | No (%) of cases (n=686) | No (%) of comparison women (n=1227) | Unadjusted odds ratio (95% CI) | Adjusted odds ratio* (95% CI) |
|---|---|---|---|---|
| Sociodemographic factors | ||||
| Ethnicity: | ||||
| White | 505 (74) | 1007 (82) | 1† | 1† |
| Non-white | 181 (26) | 220 (18) | 1.64 (1.31 to 2.05) | 1.50 (1.15 to 1.96) |
| Age (years): | ||||
| <20 | 58 (8) | 62 (5) | 2.06 (1.41 to 3.00) | 2.62 (1.68 to 4.09) |
| 20-34 | 407 (59) | 897 (73) | 1† | 1† |
| ≥35 | 221 (32) | 264 (22) | 1.84 (1.49 to 2.28) | 1.77 (1.37 to 2.28) |
| Socioeconomic group: | ||||
| Managerial and professional occupations | 174 (28) | 334 (30) | 1† | 1† |
| Other occupations | 439 (72) | 766 (70) | 1.10 (0.88 to 1.37) | 1.32 (1.02 to 1.69) |
| Smoking status: | ||||
| Never/ex-smoker | 530 (79) | 893 (75) | 1† | 1† |
| Smoked during pregnancy | 138 (21) | 305 (25) | 0.76 (0.61 to 0.96) | 0.84 (0.64 to 1.10) |
| Booking body mass index: | ||||
| <30 | 468 (79) | 886 (83) | 1† | 1† |
| ≥30 | 124 (21) | 186 (17) | 1.26 (0.98 to 1.63) | 1.13 (0.87 to 6.45) |
| Pregnancy related factors | ||||
| Primiparous | 280 (41) | 525 (43) | 0.92 (0.76 to 1.11) | 1.07 (0.85 to 1.34) |
| Multiparous | 405 (59) | 696 (57) | 1† | 1† |
Hosmer-Lemeshow goodness of fit χ2=6.56, df=8, P=0.585.
*Each adjusted for all other factors listed in the table.
†Baseline comparison group.