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. Author manuscript; available in PMC: 2009 Dec 1.
Published in final edited form as: J Geriatr Psychiatry Neurol. 2008 Dec;21(4):223–231. doi: 10.1177/0891988708324936

Table 3.

GAD-Q-IV With Cut Points of 4.5 and Item 2: Sensitivity, Specificity, Positive Predictive Value, Negative Predictive Value, Kappa Table

GAD-Q-IV
Cut point = 4.5
 GAD-Q-IV
Item 2
 Totals
GAD present GAD absent GAD present GAD absent
SCID Dx
 GAD present (%) 75 (39) 35 (18) 86 (45) 24 (13) N = 110 (58)
 GAD absent (%) 23 (12) 58 (31) 25 (15) 56 (27) N = 81 (42)
Totals (%) 98 (51) 93 (49) 111 (61) 80 (39) N = 191 (100)
Sensitivity (%) 68 78
Specificity (%) 72 69
Positive predictive value (%) 77 77
Negative predictive value (%) 62 70
Correctly classified (%) 133 (70) 142 (74)
Kappa reliabilities between questionnaire cutoff method and SCID Kappa = .39 Kappa = .47

Abbreviations: GAD, generalized anxiety disorder; GAD-Q-IV, Generalized Anxiety Disorder Questionnaire-IV; SCID, Structured Clinical Interview for Diagnosis.