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Table 3 Prevalence and adjusted odds ratios for overweight and obesity 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 % 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
  1. 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
  2. SS same sex, OS opposite sex