2.7. Statistical Analysis
The sample size was calculated based on an 18-month intervention trial on the effects of calcium supplementation (300 mg) on forearm bone health in Chinese children aged seven years old [Participants who completed all visits for BMD/BMC tests were included in the final analyses. Continuous variables were presented as means ± SDs or medians and interquartile (IQR), and categorical variables were expressed as numbers (percentages). Baseline characteristics were compared using Student’s 