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Table 2 Performance of a screening test

From: The strengths and difficulties questionnaire as a screening instrument for norwegian child and adolescent mental health services, application of UK scoring algorithms

SDQ Gold standard
   Diagnosis No diagnosis Total
  Test positive a b a + b
  Test negative c d c + d
  Total a + c b + d a + b + c + d
  1. Note. a = True positive, b = False positive, c = False negative, d = True negative.