Data collection
osteopenia
OSTEOPENIA, OSTEOPOROSIS, COMPLICATIONS
One of the most reliable markers of vit D status is serum 25 hydroxy vitamin D (25(OH)D). In the general population, vit D insufficiency and deficiency were defined as the concentrations of 25(OH)D between 21 to 29 ng/mL (53 to 73 nmol/L), or less than 20 ng/mL (50 nmol/L) respectively [Serum 25(OH)D levels were measured by liquid chromatography-tandem mass spectroscopy (SCIEX API 5000 Triple Quad Mass Spectrometer) at three time points: pre-aHSCT (baseline), day 30 and day 100 post-aHSCT. The magnitude of change in 25(OH)D for each patient, and the proportion of patients with normal 25(OH)D at post-aHSCT were then calculated, respectively. The total amount of vit DTo evaluate the potential contribution of vit D to post-transplant complications, we assessed the effects of serum 25(OH)D on bone health using dual-energy x-ray absorptiometry (DXA) at pre-aHSCT (baseline) and day 100 post-aHSCT, and categorized using the World Health Organization definition: normal: T-score > –1.0 SD, osteopenia: T-score between -1.0 and –2.5 SD, osteoporosis: T-score ≤ –2.5 SD [