identification number
sex
adolescent skin color grouped (white/non white)
maternal smoking during pregnancy
maternal age (years)
maternal age grouped
family income
family income grouped
maternal education (years)
maternal education grouped
birth weight (grams)
birth weight grouped
gestational age at birth grouped
height-for-age at 12 months (z-score)
breastfeeding (no, yes)
total duration of breastfeeding (months)
total duration of breastfeeding grouped
pattern of breastfeeding at three months
height in meters at 18 years of age
BMD whole body at 18 years of age
BMC whole body at 18 years of age
wheighing
N article