Table 2.
RT-PCR positive and negative rates for each category.
| Sum of single observations | RT-PCR positive | RT-PCR negative | kappa (95 % CI)∗ | |
|---|---|---|---|---|
|
CO-RADS | ||||
| CO-RADS 1 | 170 | 10 (5.9 %) | 160 (94.1 %) | 0.58 (0.54–0.62) |
| CO-RADS 2 | 256 | 8 (3.1 %) | 248 (96.9 %) | 0.39 (0.35–0.43) |
| CO-RADS 3 | 107 | 2 (1.9 %) | 105 (98.1 %) | 0.25 (0.21–0.29) |
| CO-RADS 4 | 236 | 25 (10.6 %) | 211 (89.4 %) | 0.35 (0.31–0.39) |
| CO-RADS 5 |
155 |
111 (71.6 %) |
44 (28.4 %) |
0.76 (0.72–0.80) |
|
COVID-RADS | ||||
| COVID-RADS 0 | 44 | 0 (0 %) | 44 (100 %) | 0.45 (0.41–0.49) |
| COVID-RADS 1 | 209 | 13 (6.2 %) | 196 (93.8 %) | 0.28 (0.24–0.32) |
| COVID-RADS 2A | 35 | 1 (2.9 %) | 34 (97.1 %) | 0.19 (0.15–0.23) |
| COVID-RADS 2B | 472 | 54 (11.4 %) | 418 (88.6 %) | 0.35 (0.31–0.39) |
| COVID-RADS 3 |
164 |
88 (53.7 %) |
76 (46.3 %) |
0.61 (0.57–0.65) |
|
RSNA expert consensus statement | ||||
| Cov19Neg | 150 | 8 (5.3 %) | 142 (94.7 %) | 0.56 (0.52–0.60) |
| Cov19Aty | 246 | 9 (3.7 %) | 237 (96.3 %) | 0.38 (0.34–0.42) |
| Cov19Ind | 315 | 10 (3.2 %) | 305 (96.8 %) | 0.38 (0.34–0.43) |
| Cov19Typ | 213 | 129 (60.6 %) | 84 (39.4 %) | 0.69 (0.65–0.73) |
RT-PCR, reverse transcriptase-polymerase chain reaction; CO-RADS, COVID-19 Reporting and Data System; COVID-RADS, COVID-19 Imaging Reporting and Data System; CI, confidence interval, RSNA, Radiological Society of North America; Cov19Neg/Aty/Ind/Typ, negative for pneumonia/atypical findings/indeterminate findings/typical findings in the RSNA expert consensus statement.
∗
Fleiss' kappa.