The three DASS-21 subscales were highly correlated with each other ( r s = 0.63–0.73). The EFA was appropriate as indicated by a Kaiser–Meyer–Olkin measure of sampling adequacy of >0.90 and a highly significant Bartlett's test of sphericity.
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Assessment of outcome measures for cost-utility analysis in depression: mapping depression scales onto the EQ-5D-5L.
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