Comparative study of correlates of early age at menarche among Mexican and Egyptian adolescents

An estimated of 4,143 Mexican and Egyptian adolescents girls were studied to determine whether early age at menarche varied across body mass index (BMI), socioeconomic level, and urban rural residence. It was found that menarche at an earlier age was most strongly associated with overweight and obesity in both Mexican and Egyptian adolescents, while urban residence and high socioeconomic level were associated with Mexican adolescents only.