calciumL {LMMstar}

Data From The Calcium Supplements Study (Long Format)

Description

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 P).

• 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).

Usage

data(calciumL)

References

TO ADD