- age
Decimal age in years ranging from birth to 21.
- hgt
Standing height in centimetres.
- wgt
Body weight recorded in kilograms.
- bmi
Body mass index.
- hc
Head circumference in centimetres.
- gen
Ordered factor describing genital Tanner stage (G1--G5).
- phb
Ordered factor indicating pubic hair stage (P1--P6).
- tv
Testicular volume in millilitres.
- reg
Region of residence (north, east, west, south, city).