Table 3.
Risk factors for a recurrent breech presentation at term in a second pregnancy in the period 1994–2002 in New South Wales
| Factor | Second delivery, n (%) | Crude RR (95% CI) | Adjusted RR (95% CI)* | |
|---|---|---|---|---|
| First pregnancy factors | No breech n= 4342 (90.1) | Breech n = 475 (9.9) | ||
| Maternal age | ||||
| <20 years | 261 (6.0) | 16 (3.4) | 0.59 (0.36–0.95) | 0.57 (0.34–0.95) |
| 20–34 years | 3739 (86.1) | 108 (85.9) | Reference | Reference |
| ≥35 years | 342 (7.9) | 51 (10.7) | 1.32 (1.00–1.73) | 1.23 (0.93–1.63) |
| Maternal diabetes | 156 (3.6) | 26 (5.5) | 1.47 (1.02–2.13) | 1.45 (1.00–2.09) |
| Placenta praevia | 34 (0.8) | 12 (2.5) | 2.69 (1.64–4.41) | 2.23 (1.35–3.68) |
| Caesarean delivery | 3732 (86.0) | 422 (88.8) | 1.27 (0.97–1.67) | 1.19 (0.90–1.57) |
| Baby birthweight for gestational age | ||||
| <10th percentile | 572 (13.2) | 69 (14.5) | 1.13 (0.89–1.45) | 1.17 (0.92–1.50) |
| 10–90th percentile | 3471 (80.0) | 364 (76.6) | Reference | Reference |
| >90th percentile | 298 (6.9) | 42 (8.8) | 1.30 (0.96–1.76) | 1.26 (0.93–1.70) |
| Second pregnancy factors | ||||
| Placenta praevia | 27 (0.6) | 11 (2.3) | 2.98 (1.80–4.94) | 2.48 (1.49–4.11) |
| Delivery hospital | ||||
| Rural/district | 1347 (31.0) | 149 (31.4) | 1.12 (0.91–1.38) | 1.16 (0.94–1.43) |
| Regional/tertiary | 1747 (40.2) | 171 (36.0) | Reference | Reference |
| Private | 1248 (28.7) | 155 (32.6) | 1.24 (1.01–1.52) | 1.15 (0.94–1.42) |
| Female infant | 2058 (47.4) | 248 (52.2) | 1.23 (1.02–1.49) | 1.22 (1.03–1.45) |
| Birth defect | 35 (0.8) | 10 (2.1) | 2.28 (1.31–3.97) | 2.41 (1.39–4.19) |
*
Analyses adjusted for all other factors presented.