Stature for Age - Pediatric Growth Standard — p_height_for

Stature for age quantile, distribution, and zscore function based on LMS data from the CDC and WHO.

Usage

p_height_for_age(
  q,
  male,
  age,
  source = getOption("pedbp_pgs_source", "CDC"),
  ...
)

q_height_for_age(
  p,
  male,
  age,
  source = getOption("pedbp_pgs_source", "CDC"),
  ...
)

z_height_for_age(
  q,
  male,
  age,
  source = getOption("pedbp_pgs_source", "CDC"),
  ...
)

p_length_for_age(
  q,
  male,
  age,
  source = getOption("pedbp_pgs_source", "CDC"),
  ...
)

q_length_for_age(
  p,
  male,
  age,
  source = getOption("pedbp_pgs_source", "CDC"),
  ...
)

z_length_for_age(
  q,
  male,
  age,
  source = getOption("pedbp_pgs_source", "CDC"),
  ...
)

Arguments

q: a vector of quantiles
male: integer value, 1 = male, 0 = female
age: numeric age, in months
source: a character string denoting the data source providing the parameters needed for the estimate. Valid values are "CDC" and "WHO". This can be set explicitly, or by using the pedbp_pgs_source option.
...: pass through
p: a vector of probabilities

Value

p_ method return values from the estimated distribution function.

q_ methods return values from the estimated quantile function.

z_ methods return standard scores.

Notes

CDC Recommends using WHO growth charts for infants and children ages 0 to 2 years of age in the U.S. and CDC growth charts to monitor growth for children age 2 years and older in the U.S.

References

https://www.cdc.gov/growthcharts/percentile_data_files.htm, https://www.who.int/tools/child-growth-standards/standards

Examples


# Find the first quartile height for a 66 month old female.
# The quantile based on CDC data is slightly less than the quantile based on
# the data from the WHO
q_height_for_age(p = 0.25, age = 66, male = 0, source = c("CDC", "WHO"))
#> [1] 107.6194 108.8470

# The 90th quantile length/height for a 24 month female: note that these
# values are similar, but not identical
q_length_for_age(p = 0.9, age = 24, male = 0, source = c("CDC"))
#> [1] 89.79282
q_height_for_age(p = 0.9, age = 24, male = 0, source = c("CDC"))
#> [1] 89.40951

# Find the percentile for a 28 month old male with a stature (height/length)
# of 88 cm
p_height_for_age(q = 88, male = 1, age = 28, source = "CDC")
#> [1] 0.3730417
p_height_for_age(q = 88, male = 1, age = 28, source = "WHO")
#> Warning: age/stature below lower limit
#> [1] NaN
p_length_for_age(q = 88, male = 1, age = 28, source = "CDC")
#> [1] 0.2944436
p_length_for_age(q = 88, male = 1, age = 28, source = "WHO")
#> [1] 0.2325074

# correseponding standard scores
z_height_for_age(q = 88, male = 1, age = 28, source = "CDC")
#> [1] -0.323808
z_height_for_age(q = 88, male = 1, age = 28, source = "WHO")
#> Warning: age/stature below lower limit
#> [1] NaN
z_length_for_age(q = 88, male = 1, age = 28, source = "CDC")
#> [1] -0.5404492
z_length_for_age(q = 88, male = 1, age = 28, source = "WHO")
#> [1] -0.7306143

Stature for Age - Pediatric Growth Standard