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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.