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Thecentile package

• Defines the reference interchange format (RIF), a simple text formatfor exchanging growth references;
• Provides tools for reading and validating RIF files;
• Names and loads references asR objects;
• Converts between measurements, Z-scores and centiles;
• Contains built-in WHO Multicentre Growth Standard for height, weight,head circumference and body mass index.

The currently supported distributions are normal (NO), Lambda-Mu-Sigma(LMS), Box-Cox Green Cole (BCCG), Box-Cox Power Exponential (BCPE)and Box-Cox t (BCT).

You can install the development version ofcentile with:

remotes::install_github("growthcharts/centile")

Generate a reference table for the WHO Multicentre Growth Standard forweight of boys aged 0-5 years:

library(centile)calculate_centile_table(x=0:5,z=-2:2,refcode="who_2006_wgt_male_")#>        Z-2   Z-1    Z0    Z1    Z2#> [1,]  2.46  2.88  3.35  3.86  4.42#> [2,]  7.74  8.65  9.65 10.76 11.99#> [3,]  9.67 10.84 12.15 13.62 15.28#> [4,] 11.28 12.71 14.34 16.20 18.31#> [5,] 12.71 14.40 16.35 18.59 21.18#> [6,] 14.07 16.04 18.34 21.02 24.16

We obtain percentiles as follows:

library(centile)calculate_centile_table(x=0:5,p= c(10,50,90),refcode="who_2006_wgt_male_")#>        P10   P50   P90#> [1,]  2.76  3.35  4.01#> [2,]  8.38  9.65 11.09#> [3,] 10.50 12.15 14.07#> [4,] 12.29 14.34 16.77#> [5,] 13.90 16.35 19.28#> [6,] 15.45 18.34 21.86