Hi

This is probably not the site for me to post this message, but I have

run out various options and would appreciate any one who has the

knowledge to help me with my problem. I would like to calculate birth

weight z-scores of infants at each gestational age based on US

National reference (1991). I Know how to compute the z-score in spss,

but just that I don't have the values for Population means and SD at

each respective gestational age. For example, for gest age 34 weeks,

the population mean is... and the SD is..., with these values I can

work out the z-scores (bwt-pop_mean/SD). I would appreciate if someone

could direct me to the relevent reference to get these values. I have

searched the literature, but they don't specifically have these values

listed. Any help uch appreciated.