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An interaction between maternal 25(OH)D and maternal calcium intake was observed. Adolescents consuming <1050 mg Ca/d and those with 25(OH)D >50 nmol/L had significantly higher fetal femur (**P = 0.001) and humerus (*P = 0.030) z scores. Among adolescents who consumed ≥1050 mg Ca/d, no significant differences in fetal long bone z scores were found between adolescents who were 25(OH)D sufficient and those who were insufficient. 25(OH)D, 25-hydroxyvitamin D.
