Table 3.
Multivariable‐adjusted odds ratios and 95% confidence intervals for obesity according to birth weight, the Shanghai Men's Health Study and the Shanghai Women's Health Study
| Birth weight (g) | Percentile | OR (95% CI) | |||
|---|---|---|---|---|---|
| For overall obesity* | For central obesity | ||||
| By WC† | By WHR‡ | By WHtR§ | |||
| 2500 | 10th | 0.73 (0.67–0.79) | 0.88 (0.78–0.98) | 1.05 (0.96–1.14) | 1.17 (1.04–1.32) |
| 2750 | 20th | 0.75 (0.69–0.81) | 0.91 (0.82–1.01) | 1.03 (0.96–1.12) | 1.14 (1.02–1.27) |
| 3000 | 30th | 0.89 (0.86–0.92) | 0.98 (0.93–1.01) | 1.01 (0.98–1.04) | 1.05 (1.01–1.10) |
| 3000 | 40th | 0.89 (0.86–0.92) | 0.98 (0.93–1.01) | 1.01 (0.98–1.04) | 1.05 (1.01–1.10) |
| 3100 | 50th | 1.00 (Reference) | 1.00 (Reference) | 1.00 (Reference) | 1.00 (Reference) |
| 3250 | 60th | 1.15 (1.12–1.17) | 1.01 (0.98–1.04) | 0.98 (0.96–1.00) | 0.92 (0.89–0.95) |
| 3500 | 70th | 1.32 (1.25–1.39) | 0.96 (0.89–1.04) | 0.94 (0.89–1.00) | 0.80 (0.74–0.86) |
| 3650 | 80th | 1.39 (1.29–1.49) | 0.94 (0.85–1.04) | 0.92 (0.86–1.00) | 0.75 (0.67–0.83) |
| 4000 | 90th | 1.53 (1.40–1.67) | 0.91 (0.81–1.03) | 0.89 (0.81–0.98) | 0.67 (0.59–0.77) |
| P‐values | |||||
| For overall significance | <0.0001 | 0.1963 | 0.0018 | <0.0001 | |
| For linearity | 0.0112 | 0.6918 | 0.8160 | 0.9337 | |
| For non‐linearity | <0.0001 | 0.1381 | 0.7731 | 0.0068 | |
Multivariable‐adjusted odds ratios (ORs) were estimated using a logistic regression model with restricted cubic spline functions.
All ORs are adjusted for age, sex, education, per capita income, smoking, alcohol consumption, regular exercise, and having been breastfed; ORs for central obesity are additionally adjusted for body mass index (BMI) as a continuous variable.
CI, confidence interval.
Defined as BMI ≥25 kg/m2.
Referring to waist circumference (WC) ≥80 cm for women and ≥ 85 cm for men.
Referring to a waist: hip ratio (WHR) >0.80 for women and > 0.90 for men.
Referring to waist: height ratio (WHtR) ≥0.50 for men and women.