Table 4.
Bivariate and multivariate logistic regression analysis of likelihood of CS in the ten Robson groups during last time period compared with first time period
| Robson group |
2000–2002 |
2009–2011 |
|
|---|---|---|---|
| OR | Crude OR (95% CI) | Adjusted OR (95% CI) | |
| 1. Nullipara, single, cephalic, birth weight ≥ 2.5 kg, spontaneous labour |
1 |
3.9 (3.6–4.1) |
2.4 (2.2–2.6)a |
| 2. Nullipara, single, cephalic, birth weight ≥ 2.5 kg, induced labour or elective CS |
1 |
17 (11–26) |
12 (7.5–20)b |
| 3. Multipara, no previous CS, single, cephalic, birth weight ≥ 2.5 kg, spontaneous labour |
1 |
3.5 (3.3–3.7) |
2.6 (2.4–2.8)a |
| 4. Multipara, no previous CS, single, cephalic, birth weight ≥ 2.5 kg, induced labour or elective CS |
1 |
30 (19–48) |
30 (19–48)c |
| 5. Previous CS, single, cephalic, birth weight ≥ 2.5 kg |
1 |
6.9 (5.9–8.2) |
6.3 (5.1–7.8)d |
| 6. Nullipara, single, breech |
1 |
4.8 (3.3–6.9) |
2.6 (1.7–4.0)a |
| 7. Multipara, single, breech |
1 |
4.8 (3.5–6.5) |
4.1 (3.0–5.7)e |
| 8. Multiple pregnancies |
1 |
3.7 (3.1–4.3) |
3.1 (2.6–3.7)f |
| 9. Single, transverse or oblique lie |
1 |
1.4 (0.6–3.0) |
1.4 (0.6-3.0)c |
| 10. Single, cephalic, birth weight < 2.5 kg |
1 |
3.7 (3.4–4.1) |
2.7 (2.5–3.1)a |
| Total | 1 | 4.0 (3.9–4.1) | 2.8 (2.7–2.9)a |
aadjusted for maternal age, referral status, and private healthcare insurance.
badjusted for maternal age, no significant change from referral status or private healthcare insurance.
cno significant change from any of the factors.
dadjusted for maternal age and private healthcare insurance, no significant change from referral status.
eadjusted for private healthcare insurance, no significant change from maternal age or referral status.
fadjusted for referral status and private healthcare insurance, no significant change from maternal age.
Odds ratios (OR) and 95% confidence intervals (CI).