Relative spinal bone mineral density measurements on 261 North
American adolescents. Each value is the difference in
taken on two consecutive visits, divided by the average. The age is
the average age over the two visits.
A dataframe with four columns:
ID of the child
male or female
Relative Spinal bone mineral density.
Bachrach, L.K., Hastie, T., Wang, M.-C., Narasimhan, B., Marcus, R. (1999). Bone Mineral Acquisition in Healthy Asian, Hispanic, Black and Caucasian Youth. A Longitudinal Study. J Clin Endocrinol Metab 84, 4702-12.
Eilers, P.H.C. and Marx, B.D. (2021). Practical Smoothing, The Joys of P-splines. Cambridge University Press.
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