Diagnostic accuracy of chest radiograph and CTA features in patients who had undergone both a chest radiograph and a SARS-CoV-2 RT-PCR test (n = 59)
| Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) | |
|---|---|---|---|---|
| COVID-typical/indeterminate (chest radiograph)a | 50% (29–71) | 61% (46–74) | 36% (24–51) | 74% (62–82) |
| Presence of GGO (CTA) | 83% (58–96) | 80% (65–91) | 65% (43–83) | 92% (76–98) |
| Focal GGO (CTA) | 56% (31–78) | 85% (70–94) | 62% (36–84) | 81% (66–91) |
| Bilateral GGO (CTA) | 56% (31–78) | 83% (67–92) | 59% (33–81) | 80% (65–91) |
| Peripheral GGO (CTA) | 78% (52–93) | 85% (70–94) | 70% (46–87) | 90% (75–97) |
| COVID-typical/indeterminate (CTA) | 72% (46–89) | 90% (76–97) | 76% (50–92) | 88% (74–95) |
Note:—PPV indicates positive predictive value; NPV, negative predictive value; GGO, ground glass opacification.
↵a COVID-typical alone gave a low sensitivity (44%) and was excluded from further analysis.