For my masters thesis I am conducting a meta-analysis looking at the differences in CHC abilities within Autism Spectrum Disorders. I have gathered data from over 50 studies and have a range of cognitive test scores, some of which are from composite scores and others from individual subtests. I am converting the subtest scores with a mean of 10 to standard scores with a mean of 100 for the analysis but was unsure how to convert the SD's of these subtest scores also.

I hope this makes sense :-) I would appreciate any help