Calculation of standard deviation scores adduced from different growth standards (WHO, US, UK, Germany, Italy, China, etc). Therefore, the calculation of SDS-values for different measures like BMI, weight, height, head circumference, different ratios, etc. are easy to carry out. Also, references for laboratory values in children are available: serum lipids, iron-related blood parameters.
Hi
Whenever I run the sds(.) with ref = ukwho and item ='bmi' I get a series 8 of identical warnings "In regularize.values(x, y, ties, missing(ties), na.rm = na.rm) :
collapsing to unique 'x' values"
It does however produce a value which looks credible.
I am not getting this message with height or weight or with other references (such as uk1990)
Any ideas? Should the results still be reliable despite the warnings
Hi, Thank you for making such a wonderful package. I wonder if it is possible to add my own reference tables into the package so that I can draw a growth chart that fit my smaller population?
I currently have a set of tables containing age, sex, mean, standard deviation, percentile values a 5,25,50,75,90.
How to set up the correction for preterm infants when calculating SDS or percentile? It seems that we can use the kro.ref. Can you provide a example code? Or shall we set the age of preterm infants as negative values?