age
a numeric vector (years).
height
a numeric vector (cm).
menarche
a numeric vector. Has menarche occurred (code 1: no, 2: yes)?
sex
a numeric vector (1: boy, 2: girl).
igf1
a numeric vector, insulin-like growth factor
(\(\mu\mathrm{g}/\mathrm{l}\)).
tanner
a numeric vector, codes 1--5: Stages of puberty ad modum Tanner.
testvol
a numeric vector, testicular volume (ml).
weight
a numeric vector, weight (kg).