Table 3.
Prevalence and adjusted odds ratios for overweight and obesity in females and males from same- and opposite-sex twin pairs
| Phenotype | Twin type | % overweight/obese | 95% confidence intervals | Odds ratio | 95% confidence intervals |
|---|---|---|---|---|---|
| Overweight | SS females | 30.2 | 29.7, 30.7 | 1.00 (reference) | |
| OS females | 30.9 | 30.3, 31.4 | 1.03 | 0.99, 1.07 | |
| SS males | 47.0 | 46.4, 47.7 | 1.00 (reference) | ||
| OS males | 47.6 | 47.0, 48.2 | 1.02 | 0.99, 1.06 | |
| Obesity | SS females | 8.45 | 8.15, 8.76 | 1.00 (reference) | |
| OS females | 8.11 | 7.78, 8.44 | 0.96 | 0.90, 1.01 | |
| SS males | 8.04 | 7.70, 8.34 | 1.00 (reference) | ||
| OS males | 8.48 | 8.13, 8.83 | 1.06 | 1.00, 1.13 |
The results are adjusted for cohort, age and birth year, and the non-independence (clustering) of observations within twin pairs. Overweight was defined as ≥23 kg/m2 and obesity as ≥27.5 kg/m2 for Asian cohorts and as BMI ≥25 kg/m2 and BMI ≥30 kg/m2, respectively, for all other cohorts
SS same sex, OS opposite sex