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Change in CTX (A) and P1NP (B) relative to baseline and stratified by baseline serum 25(OH)D level of 30ng/ml. Each time point is represented as the mean serum level relative to baseline with standard error. Time is coded as a continuous variable based on months from injury. Time, serum 25(OH)D, and the interaction between time and serum 25(OH)D are included as fixed effects with serum CTX (A) and P1NP (B) levels as dependent variables.
