Fixed-effect regression analyses of body composition measurements and serum metabolites within 235 MZ twin pairs; genders combined.

Abbreviations are the same as in Table 2.All regression models were adjusted for age, sex, region, social economic status, smoking status, drinking status and physical activity.a P values for interaction between sex and each of the body composition measurements on the serum metabolite levels.*p**p***pFixed-effect regression analyses of body composition measurements and serum metabolites within 235 MZ twin pairs; genders combined.