Cross-sectional anthropometric records for 7,482 Dutch boys aged 0 to 21 years that were used to construct the 1997 Dutch growth references. The dataset stores standard auxological indicators together with puberty and regional classification variables.
Format
A data frame with 7,482 rows and 9 variables:
- 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).
Source
Fredriks, A. M., van Buuren, S., Burgmeijer, R. J., Meulmeester, J. F., Beuker, R. J., Brugman, E., Roede, M. J., Verloove-Vanhorick, S. P., & Wit, J. M. (2000). Continuing positive secular growth change in The Netherlands 1955-1997. Pediatric Research, 47, 316-323.
Fredriks, A. M., van Buuren, S., Wit, J. M., & Verloove-Vanhorick, S. P. (2000). Body index measurements in 1996-97 compared with 1980. Archives of Disease in Childhood, 82, 107-112.
Details
The table combines the complete cross-sectional sample of Dutch boys aged 0–21 years that formed the basis of the Dutch 1997 growth references. Tanner stage variables are stored as ordered factors, while the region indicator is a nominal factor.
Examples
data(boys7482)
str(boys7482)
#> 'data.frame': 7482 obs. of 9 variables:
#> $ age: num 0.032 0.035 0.035 0.038 0.043 0.046 0.046 0.046 0.049 0.049 ...
#> $ hgt: num 53.3 50.8 50.1 53.5 52.1 50.5 NA 52.5 55 52.9 ...
#> $ wgt: num 3.76 3.21 3.65 3.37 4.16 ...
#> $ bmi: num 13.2 12.4 14.5 11.8 15.3 ...
#> $ hc : num 33.6 33.6 33.7 35 36.1 36.6 36.2 38 37.4 35.1 ...
#> $ gen: Ord.factor w/ 5 levels "G1"<"G2"<"G3"<..: NA NA NA NA NA NA NA NA NA NA ...
#> $ phb: Ord.factor w/ 6 levels "P1"<"P2"<"P3"<..: NA NA NA NA NA NA NA NA NA NA ...
#> $ tv : int NA NA NA NA NA NA NA NA NA NA ...
#> $ reg: Factor w/ 5 levels "north","east",..: 4 4 4 4 4 3 3 3 3 4 ...