Table 4:

Diagnostic performance of the 4-grade scoring system (visual score 1–2 vs 3–4).

		Clopper–Pearson 95% CI
Sensitivity	63.6%	30%–89%
Specificity	77.5%	62%–89%
PPV	43.8%	20%–70%
NPV	88.6%	73%–97%

PPV, positive predictive value; NPV, negative predictive value.