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. 2023 Sep 14;308(6):1853–1862. doi: 10.1007/s00404-023-07189-0

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Fig. 2 — Serum ßCTX (a), P1NP (b), and OC (c) levels at 6 months postpartum. Exclusively breastfeeding (exc-bf) and nonexclusively breastfeeding (nonexc-bf) women were compared with controls at each visit. Results of multivariate analyses. Grey lines indicate reference levels. Bone turnover marker levels in exc-bf and nonexc-bf women were significantly higher than those of controls (all ps < .001) and either close to (ßCTX, OC) or above the upper reference limit (P1NP). ßCTX was significantly higher in exc-bf women than in nonexc-bf women (p = .002)