Reference percentiles for pubertal stage variables by age, based on the
Dutch 1997 growth study (Fredriks et al., 2000). Used by
calculate_sds to convert an observed age/stage combination
into a standard deviation score.
Format
A list with six components, one per pubertal stage variable:
gen, phb, tv, bre, phg and
men. Each component is a data frame whose first column is
age and whose remaining columns hold the age at which 50
the reference population reaches each stage.
Source
Fredriks AM, van Buuren S, Burgmeijer RJ, et al. (2000).
Continuing positive secular growth change in The Netherlands 1955-1997.
Pediatric Research, 47(3), 316-323. Percentiles were refit in R
from data-raw/data/pub.ref.1997r.txt, correcting testis-volume
(tv) fitting errors present in the original S-Plus-fitted
pub.ref.1997.txt; the genital-stage columns match Table 5 of
van Buuren S (2014). Growth charts of human development.
Statistical Methods in Medical Research, 23(4), 346-368.
doi:10.1177/0962280212473300