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Table 1 Number of patients assigned to each category in both classifications and percentage of confirmed RT-PCR COVID-19 cases

From: Comparison of the RSNA chest CT classification system and CO-RADS system in reporting COVID-19 pneumonia in symptomatic and asymptomatic patients

   PCR Test value P-value Sig.
Negative Positive
No. = 115 No. = 136
RSNA probability rater 1 Typical 7 (9.6%) 66 (90.4%) 56.221 0.000 HS
Indeterminate 26 (53.1%) 23 (46.9%)
Atypical 35 (66.0%) 18 (34.0%)
Negative 47 (61.8%) 29 (38.2%)
RSNA probability rater 2 Typical 23 (26.4%) 64 (73.6%) 23.947 0.000 HS
Indeterminate 32 (53.3%) 28 (46.7%)
Atypical 21 (72.4%) 8 (27.6%)
Negative 39 (52.0%) 36 (48.0%)
RSNA probability rater 3 Typical 15 (18.8%) 65 (81.2%) 44.139 0.000 HS
  Indeterminate 27 (49.1%) 28 (50.9%)
Atypical 37 (77.1%) 11 (22.9%)
Negative 36 (52.9%) 32 (47.1%)
CO-RADS rater 1 1 48 (60.0%) 32 (40.0%) 55.532 0.000 HS
2 34 (69.4%) 15 (30.6%)
3 23 (54.8%) 19 (45.2%)
4 5 (20.8%) 19 (79.2%)
5 5 (8.9%) 51 (91.1%)
CO-RADS rater 2 1 39 (52.0%) 36 (48.0%) 24.254 0.000 HS
2 21 (72.4%) 8 (27.6%)
3 16 (57.1%) 12 (42.9%)
4 16 (50.0%) 16 (50.0%)
5 23 (26.4%) 64 (73.6%)
CO-RADS rater 3 1 39 (54.9%) 32 (45.1%) 34.104 0.000 HS
2 32 (74.4%) 11 (25.6%)
3 11 (55.0%) 9 (45.0%)
4 12 (40.0%) 18 (60.0%)
5 21 (24.1%) 66 (75.9%)
  1. Data are expressed in number and percentage. The probability of error (P-value) at 0.05 was considered significant (S), 0.01 and 0.001 are highly significant (HS), while > 0.05 are considered non-significant (NS)