Table 3.
Association between parity and measures of obesity, stratified by country
| Obesity measure | Number of pregnancies | U.S.
|
Mexico
|
||
|---|---|---|---|---|---|
| N | Odds ratio (95 % confidence interval)a | N | Odds ratio (95 % confidence interval)a | ||
| Body mass index ≥30 kg/m2 | 1–2 | 190 | 1.00 | 135 | 1.00 |
| 3 | 147 | 1.60 (0.98–2.59) | 134 | 1.10 (0.61–1.98) | |
| ≥ 4 | 145 | 1.29 (0.74–2.27) | 215 | 0.92 (0.49–1.73) | |
| p trend | 0.324 | 0.714 | |||
| Waist circumference ≥35 in | 1–2 | 131 | 1.00 | 130 | 1.00 |
| 3 | 100 | 1.73 (0.96–3.10) | 128 | 1.22 (0.67–2.23) | |
| ≥ 4 | 103 | 1.51 (0.79–2.90) | 206 | 1.48 (0.76–2.87) | |
| p trend | 0.155 | 0.246 | |||
| Waist-to-hip ratio ≥0.85 | 1–2 | 131 | 1.00 | 127 | 1.00 |
| 3 | 99 | 1.10 (0.60–1.99) | 124 | 0.64 (0.32–1.31) | |
| ≥ 4 | 103 | 1.21 (0.60–2.44) | 205 | 0.42 (0.19–0.90) | |
| p trend | 0.587 | 0.025 | |||
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 (US, 482; Mexico, 484) 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 (US, 334; Mexico, 464) 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 (US, 333; Mexico, 456) due to missing data for covariates
There were no significant interactions between parity and country on any of the three obesity measures (likelihood ratio test, all p > 0.2)