Elective induction versus spontaneous labour in Latin America
Gláucia Virgínia Guerra, José Guilherme Cecatti, João Paulo Souza, Aníbal Faúndes, Sirlei Siani Morais, Ahmet Metin Gülmezoglu, Renato Passini, Mary Angela Parpinelli, Guillermo Carroli, for the WHO Global Survey on Maternal & Perinatal Health in Latin America Study Group
Volume 89, Number 9, September 2011, 657-665
Table 2. Crude odds ratios (OR) and adjusted odds ratios (ORadj) of elective labour induction in women with low-risk pregnancies, by demographic and other characteristics, in selected Latin American countries, 2005
| Characteristic | Spontaneous onset of labour |
Elective induction |
OR (95% CI) | ORadj (95% CI)a | |||
|---|---|---|---|---|---|---|---|
| No | % | No | % | ||||
| Age (years) | |||||||
| 10–19 | 369 | 19.99 | 7666 | 21.55 | 0.90 (0.80–1.01) | 0.96 (0.84–1.10) | |
| 20–34 | 1347 | 72.97 | 25 181 | 70.77 | 1.00 | 1.00 | |
| ≥ 35 | 130 | 7.04 | 2733 | 7.68 | 0.89 (0.74–1.07) | 0.98 (0.77–1.24) | |
| Missing | 1 | – | 17 | – | – | – | |
| Marital status | |||||||
| Having a partner | 26 668 | 75.27 | 1513 | 81.96 | 1.00 | 1.00 | |
| No partner | 8762 | 24.73 | 333 | 18.04 | 0.67 (0.59–0.76) | 0.76 (0.67–0.87) | |
| Missing | 167 | – | 1 | – | – | – | |
| Years of schooling | |||||||
| < 7 | 9649 | 28.72 | 488 | 28.82 | 0.92 (0.77–1.11) | 1.10 (0.91–1.34) | |
| 7–12 | 21 073 | 62.72 | 1047 | 61.85 | 0.90 (0.76–1.07) | 1.06 (0.89–1.26) | |
| > 12 | 2877 | 8.56 | 158 | 9.33 | 1.00 | 1.00 | |
| Missing | 1998 | – | 154 | – | – | – | |
| Parity | |||||||
| Primipara | 15 565 | 43.81 | 828 | 44.83 | 1.05 (0.95–1.17) | 1.13 (1.01–1.27) | |
| 2–3 deliveries | 15 232 | 42.87 | 769 | 41.64 | 1.00 | 1.00 | |
| > 3 deliveries | 4734 | 13.32 | 250 | 13.54 | 1.05 (0.90–1.21) | 1.07 (0.91–1.26) | |
| Missing | 66 | – | – | – | – | – | |
| Health-care facility | |||||||
| Public | 26 734 | 75.10 | 1047 | 56.68 | 1.00 | 1.00 | |
| Social security | 6118 | 17.19 | 666 | 36.06 | 2.78 (2.51–3.08) | 2.90 (2.61–3.22) | |
| Private | 2741 | 7.71 | 134 | 7.26 | 1.25 (1.04–1.50) | 1.85 (1.47–2.32) | |
| BMI (kg/m2) | |||||||
| ≤ 30 | 16 334 | 59.22 | 890 | 56.12 | 1.00 | Not usedb | |
| > 30 (obesity) | 11 250 | 40.78 | 696 | 43.88 | 1.14 (1.03–1.26) | – | |
| Missing | 8013 | – | 261 | – | – | – | |
BMI, body mass index; CI, confidence interval.
a Simple and multiple logistic regression model (including all variables except BMI).
b BMI was not used in multiple analyses due to the high number of cases in which data were missing.