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Frequency distribution of maternal urinary CTX (μg/mmol creatinine) in early (14 weeks of gestation) (median: 219.4; IQR: 154.7–306.4; n = 493) and late pregnancy (34 weeks of gestation) (median: 437.4; IQR: 292.3–633.0; n = 498) in all mothers with a measurement of CTX. CTX, C-terminal telopeptide of type I collagen.
