Data from a randomized study including 112 girls at age 11 investigate the effect of a calcium supplement (n=55) vs. placebo (n=57) on bone mineral density over a 2 year follow-up. The clinical question is: does a calcium supplement help to increase bone gain in adolescent women? This dataset is in the long format (i.e. one line per measurement).
girl Patient identifier
grp Treatment group: calcium supplement (coded
C) or placebo (coded
visit Visit index
bmd Bone mineral density (mg/cm3)
time.obs Visit time (in years)
time.num Scheduled visit time (numeric variable, in years)
time.fac Scheduled visit time (factor variable)
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