Table 3. Accuracy and predictive values of LFIA for SARS-CoV-2 IgG in 229 previous infected subjects from 3 to 6 months after the infection (from Spicuzza L et al. 2022).

	Sensitivity (95% CI)	Specificity (95% CI)	PPV	NPV (95% CI)	Accuracy (95% CI)
Overall	95.5 (91.7–97.9)	100 (78.1–100)	100	63.0 (47.3–76.3)	95.9 (92.3–96.1)
3–4 months	96.4 (88.7–99.2)	100 (54.0–100)	100	67.8 (40.9–86.4)	96.6 (90.5–99.3)
6–7 months	95.0 (89.4–98.1)	100 (66.3–100)	100	60.0 (40.8–76.6)	93.3 (90.1–98.2)