Table 2.
Association between parity and measures of obesity
| Obesity measure | Number of pregnancies | N | Odds ratio (95 % confidence interval)
|
||
|---|---|---|---|---|---|
| Crude | Age- and site-adjusted | Multivariatea | |||
| Body mass index ≥30 kg/m2 | 1–2 | 328 | 1.00 | 1.00 | 1.00 |
| 3 | 281 | 1.56 (1.12–2.17) | 1.53 (1.09–2.15) | 1.32 (0.91–1.90) | |
| ≥4 | 365 | 1.57 (1.15–2.14) | 1.42 (1.02–1.99) | 1.10 (0.73–1.67) | |
| p trend | 0.006 | 0.042 | 0.674 | ||
| Waist circumference ≥35 in | 1–2 | 264 | 1.00 | 1.00 | 1.00 |
| 3 | 228 | 1.66 (1.13–2.42) | 1.59 (1.08–2.37) | 1.49 (0.98–2.24) | |
| ≥4 | 314 | 2.39 (1.66–3.45) | 1.84 (1.25–2.73) | 1.59 (1.01–2.47) | |
| p trend | <0.001 | 0.002 | 0.044 | ||
| Waist-to-hip ratio ≥0.85 | 1–2 | 262 | 1.00 | 1.00 | 1.00 |
| 3 | 227 | 1.17 (0.80–1.72) | 1.07 (0.72–1.59) | 0.95 (0.61–1.49) | |
| ≥4 | 313 | 1.43 (1.00–2.04) | 1.10 (0.74–1.62) | 0.77 (0.47–1.28) | |
| p trend | 0.051 | 0.645 | 0.316 | ||
a
BMI model is adjusted for age, site, age at first full-term pregnancy, and breastfeeding, and the sample size is reduced from 974 to 966 due to missing data for covariates. WC model is adjusted for age, site, education and age at first full-term pregnancy, and the sample size is reduced from 806 to 798 due to missing data for covariates. WHR multivariate model is adjusted for age, site, education, age at first full-term pregnancy, breastfeeding, smoking, physical activity, hormone contraception use, hormone replacement therapy use, and age at menarche, and the sample size is reduced from 802 to 789 due to missing data for covariates