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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

From: Does the sex of one’s co-twin affect height and BMI in adulthood? A study of dizygotic adult twins from 31 cohorts

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
  1. The results are adjusted for cohort, age and birth year, and the non-independence (clustering) of observations within twin pairs
  2. SS same sex, OS opposite sex, BMI body mass index