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The dimensional algorithm of the PHQ-9 demonstrated high criterion validity, whereas the categorical algorithm should not be applied due to its low sensitivity. Even though the PHQ-2 performed well, validity of the PHQ-9 was still superior. Hence, the PHQ-9 can be recommended as depression screener for adolescents to improve recognition rates in pediatric care.
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Allgaier et al. (2012) studied this question.
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