Table 2.
Adjusted means and regression coefficient for height (cm) and BMI (kg/m2) in females and males from same- and opposite-sex twin pairs
| Phenotype | Twin type | Mean | 95% confidence intervals | Regression coefficient | 95% confidence intervals |
|---|---|---|---|---|---|
| Height | SS females | 164.7 | 164.6, 164.8 | ||
| OS females | 165.0 | 164.9, 165.1 | 0.31 cm | 0.20, 0.41 | |
| SS males | 178.4 | 178.3, 178.4 | |||
| OS males | 178.5 | 178.4, 178.6 | 0.14 cm | 0.02, 0.27 | |
| BMI | SS females | 23.95 | 23.90, 24.00 | ||
| OS females | 24.00 | 23.05, 24.05 | 0.05 kg/m2 | −0.02, 0.12 | |
| SS males | 25.20 | 25.16, 25.25 | |||
| OS males | 25.26 | 25.22, 25.31 | 0.06 kg/m2 | 0.00, 0.12 |
The results are adjusted for cohort, age and birth year, and the non-independence (clustering) of observations within twin pairs
SS same sex, OS opposite sex, BMI body mass index