Z-score Data Files

The values corresponding to specific z-scores (-2, -1.5,-1,-0.5,0, 0.5,1,1.5,2) are contained in 8 ASCII tab-delimited data files representing the 8 different growth curves for infants (weight-for-age; length-for-age, weight-for-recumbent length; head circumference-for-age) and older children (weight-for-stature; weight-for-age; stature-for-age; and BMI-for-age). The file and corresponding chart names are below:

ZWTAGEINF: Weight-for-age charts, birth to 36 months, selected weight z-scores in kilograms, by sex and age

ZLENAGEINF: Length-for-age charts, birth to 36 months, selected recumbent length z-scores in centimeters, by sex and age

ZWTLENINF: Weight-for-recumbent length charts, birth to 36 months, selected weight z-scores in kilograms, by sex and recumbent length (in centimeters)

ZHCAGEINF: Head circumference-for-age charts, birth to 36 months, selected head circumference z-scores in centimeters, by sex and age

ZWTSTAT: Weight-for-stature charts, selected weight z-scores in kilograms, by sex and stature (in centimeters)

ZWTAGE: Weight-for-age charts, 2 to 20 years, selected weight z-scores in kilograms, by sex and age

ZSTATAGE: Stature-for-age charts, 2 to 20 years, selected stature z-scores in centimeters, by sex and age

ZBMIAGE: BMI-for-age charts, 2 to 20 years, selected BMI (kilograms/meters squared) z-scores, by sex and age

These files contain the z-scores values for the z-scores of –2, -1.5, -1, -0.5, 0, 0.5, 1, 1.5, and 2 by sex (1=male; 2=female) and single month of age.  Age is listed at the half month point for the entire month; for example, 1.5 months represents 1.0-1.99 months or 1.0 month up to but not including 2.0 months of age. The only exception is birth, which represents the point at birth. 

This page last reviewed September 23, 2002