data_anthro_for deposit.pdf

The WHO
standards are available on the website of WHO (http://www.who.int/childgrowth/en/). You find there
the software Anthro2005 for calculation of individual data (Anthro2005).

For calculating the z-scores of the new standards the LMS
procedure is used. The principle is to get from a table for a certain age and sex 3 values (LMS) which are put
into a formula For example WAZ = ((weight/M)^L-1)/(L*S)) e.g.:

Female, 9kg, 365 days => L = -0.2022, M = 8.9462, S = 0.12267

WAZ = ((9/M)^L-1)/(L*S) =
((9/8.9462)^-0.2022-1)/(-0.2022*0.12267) = 0.04885 Z-scores

On the WHO website you find only the LMS values for each month.
Wt                L                   M                  S
 9            -0.2022          8.9462        0.12267        0.048847178

To calculate the actual weight from the LSM statistics
at any cut off point use the following formula:
wt = M * ((Z * S * L) +1)^(1/L)
Where Z = Zscore you are trying to obtain
This is the reverse of the formula to calculate WAZ
etc.
And will give the standard to more decimal places for
interpolation [purposes
I
have taken 10 boys and 10 girls at 0.5 cm intervals from 60 to 110cm in height
with weight for height mean at -1Z with SD or 1.0.
These are in the sheet
WFH_Population.

For the simulation I have now added
a random variable to the weight or the height in the POP_weight and the
POP_height sheets.