V R. Weersing and P. N Walker
Evid Based Ment Health 2008 11: 76.
web only appendices 11/3/76
Notes
Continuous values were converted into dichotomous outcomes using a median split technique (that is, splitting those above the median into one variable code and those below it into another). Median splits have been criticised for increasing the probability of type I and type II errors. It is unclear what effect this technique would have on the results here.
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