The expected ranges of standard deviations of the z score distributions for the three anthropometric indicators are as follows 5. Development of a who growth reference for school aged children and adolescents. To enter years and months enter y m. For simplification the term height is used all throughout the database to cover both measurements. A comparison of low length for age weight for age and weight for length and high weight for length in us children among infants and children up to 24 months of age using the 2006 who growth standard charts and the 2000 cdc growth reference charts comparing the 23. It is influenced by both the height of the child height for age and his or her weight weight for height and its composite nature makes interpretation complex.
The values corresponding to specific z scores 2 15 1 050 051152 are contained in 8 excel data files representing the 8 different growth curves for infants weight for age. The links below provide access to the reference charts and tables by indicator. The same difference is found between a z score of 0 and a z score of 1 on the same distribution. Weight for age reflects body mass relative to chronological age. For example on the height for age distribution for a 36 month old boy the distance from a z score of 2 to a z score of 1 is 38 cm. Boys weight for length percentiles and head circumference for age percentiles cdc pdf pdf 543 kb.
For weight length and body mass index it calculates z scores and percentiles by pooling the who standard 0 5y and reference 5 19y data. Eg 4y 5m weight. Girls weight for length txt 41kb. In other words z scores have the same statistical relation to the distribution of the. Bmi for age 5 19 years height for age 5 19 years weight for age 5 10 years. The who growth charts.
There are differences in the prevalence of growth indicators when using the who growth charts compared to the cdc growth charts. In contrast the who growth charts only provide information on children up to 5 years of age. Head circumference for age and older children weight for stature. For more detailed output eg. Biologically implausible value flags head circumference and skin fold thickness you should use the original age specific who macros igrowup 0 5y and who2007 5 19y. For children 2 5 years the methods used to create the cdc growth charts and the who growth charts are similar.
To enter pounds and ounces enter. Birth to 24 months. Eg 8 4 for 8 lb and 4 oz height. En weight for length charts and tables. The z score scale is linear and therefore a fixed interval of z scores has a fixed height difference in cm or weight difference in kg for all children of the same age. Available means and sds of z scores of survey data are being included in the global database.
Predicted percentiles and z scores much over the 95th percentile using the cdc charts may be inaccurate. Valid ages from 2 to 20 years age. The following article describes the sample and methods used to construct this growth reference.
Gallery of Who Z Score Growth Chart Weight For Height
