Z is the z-score that corresponds to the percentile. Where the L, M, and S are the values from the appropriate table corresponding to the age in months of the child (** indicates an exponent, such that M(1+LSZ)**(1/L) means raising (1+LSZ) to the (1/L)th power and then multiplying the M exp(X) is the exponentiation function, e to the power X). To obtain the value (X) of a given physical measurement at a particular z-score or percentile, use the following equation: The LMS parameters are the median (M), the generalized coefficient of variation (S), and the power in the Box-Cox transformation (L). To obtain L, M, and S values at finer age or length/stature intervals interpolation could be used. The only exception is birth, which represents the point at birth. 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 smoothed 85th percentile values are included in the BMI-for-age and weight-for-stature tables. These files contain the L, M, and S parameters needed to generate exact percentiles and z-scores along with the percentile values for the 3rd, 5th, 10th, 25th, 50th, 75th, 90th, 95th, and 97th percentiles by sex (1=male 2=female) and single month of age. BMIAGE BMIAGE īMI-for-age charts, 2 to 20 years, LMS parameters and selected smoothed BMI (kilograms/meters squared) percentiles, by sex and age.Stature-for-age charts, 2 to 20 years, LMS parameters and selected smoothed stature percentiles in centimeters, by sex and age Weight-for-age charts, 2 to 20 years, LMS parameters and selected smoothed weight percentiles in kilograms, by sex and age Weight-for-stature charts, LMS parameters and selected smoothed weight percentiles in kilograms, by sex and stature (in centimeters) Head circumference-for-age charts, birth to 36 months, LMS parameters and selected smoothed head circumference percentiles in centimeters, by sex and age Weight-for-recumbent length charts, birth to 36 months, LMS parameters and selected smoothed weight percentiles in kilograms, by sex and recumbent length (in centimeters) Thus, no changes to printed graphical growth charts are needed. There is no visibly perceptible difference in the graphs of the growth curves compared to those published in 2000. The 50th percentile values have not changed and the outer percentiles differ only at or beyond the second decimal place. Length-for-age charts, birth to 36 months, LMS parameters and selected smoothed recumbent length percentiles in centimeters, by sex and ageĮrrata: The selected percentile values for length for age have been updated to correspond exactly to the published LMS values. Weight-for-age charts, birth to 36 months, LMS parameters and selected smoothed weight percentiles in kilograms, by sex and age These data remain unchanged from the initial release on of the growth charts. The file and corresponding chart names are below. Data used to produce the United States Growth Charts smoothed percentile curves are contained in 8 Excel 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).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |