Menarche at earlier age was associated with a higher BMD ( P & lt; 0.05 ).月經(jīng)初潮早的女性BMD值比月經(jīng)初潮晚的女性高 ( P & lt; 0.05 ).Delayed menarche, dysmenorrheal. Can conceive, delivered mostly girls.多有月經(jīng)初潮偏遲, 痛經(jīng)史.曾經(jīng)生育的大多是女孩兒.The associ...