Table 2.

Diagnostic test properties of marginal food security status based on the 1-item NutriSTEP® question compared with the 2-item Hunger Vital Sign™

1-item NutriSTEP®	2-item hunger vital sign™
	Yes	No	Total
Yes	45	99	144
No	8	1022	1030
Total	53	1121	1174
Sensitivity: 45 / (45 + 8) * 100 = 84.9% (95% CI: 72.4, 93.3)
Specificity: 1022 / (1022 + 99) * 100 = 91.2% (95% CI: 89.4, 92.8)
PPV: 45 / (45 + 99) * 100 = 31.3% (95% CI: 26.7, 36.2)
NPV: 1022 / (1022 + 8) * 100 = 99.2% (95% CI: 98.5, 99.6)
Likelihood Ratio (for a positive test): sensitivity / (1-specificity) = 9.6 (95% CI: 7.7, 12.0)
Likelihood Ratio (for a negative test): (1 – sensitivity / specificity) = 0.2 (95% CI: 0.1, 0.3)
Accuracy: sensitivity x prevalence + specificity x (1 – prevalence) = 90.9% (95% CI: 89.1, 92.5)