The 14-item short health anxiety inventory (SHAI-14) used as a screening tool: appropriate interpretation and diagnostic accuracy of the Swedish version

Table 2 Summary Statistics for Different Cut-off Scores on the SHAI-14

Reference group	Cut-off type	Cut-off	Sensitivity	Specificity	Prevalence	PPV	NPV	Correctly classified
Psychiatric	Symmetrically weighted	22	0.93	0.85	0.20	0.61	0.98	0.87
Psychiatric	Symmetrically weighted	22	0.93	0.85	0.25	0.67	0.97	0.87
Psychiatric	High sensitivity	13	1.00	0.50	0.20	0.33	1.00	0.60
Psychiatric	High sensitivity	13	1.00	0.50	0.25	0.40	1.00	0.63
80% healthy, 20% psychiatric	Symmetrically weighted	19	0.98	0.95	0.01	0.17	1.00	0.95
80% healthy, 20% psychiatric	Symmetrically weighted	19	0.98	0.95	0.02	0.29	1.00	0.95
80% healthy, 20% psychiatric	Symmetrically weighted	19	0.98	0.95	0.04	0.45	1.00	0.95
80% healthy, 20% psychiatric	High specificity	29	0.62	0.99	0.01	0.36	1.00	0.99
80% healthy, 20% psychiatric	High specificity	29	0.62	0.99	0.02	0.53	0.99	0.98
80% healthy, 20% psychiatric	High specificity	29	0.62	0.99	0.04	0.72	0.98	0.98

Note. Symmetrically weighted cut-off type refers to the Liu-method. High sensitivity/specificity cut-off type refers to a cut-off value that maximize sensitivity/specificity without reducing sensitivity/specificity below chance level.
Abbreviations: PPV positive predictive value, NPV negative predictive value3.5 Scenario: clinical cut-off versus healthy controls

ISSN: 1471-244X