The World Health Organization (WHO) has published data on the physical development of infants and children up to 5 years of age.
Patient selection: from 91 to 1856 days
Parameters:
(1) birthdate
(2) date of exam
(3) gender
(4) arm circumference in centimeters
age in days =
= ((age of exam) - (birthdate))
For each specified month in the tables, 3 variables are given:
(1) L = power in the Box-Cox transformation
(2) M = median
(3) S = generalized coefficient of variation
When L is not equal to 0:
Z-score for a value =
= ((((value) / M) ^ (L)) - 1) / (L * S)
