Table 1. Distribution of the McIsaac scores and corresponding frequencies of positive results of rapid antigen detection test (RADT), group A streptococcus (GAS) and heavy GAS inocula (N = 785).
n (%) | ||||
McIsaacscorea | Total | RADT-positive | GAS-positiveb | Heavy inoculumc |
1 | 12 (1) | 2/12 (17) | 3/12 (25) | 2/3 (67) |
2 | 103 (13) | 21/103 (20) | 25/103 (24) | 20/25 (80) |
3 | 262 (33) | 82/262 (31) | 89/262 (34) | 73/89 (82) |
4 | 286 (36) | 115/286 (40) | 114/286 (40) | 100/114 (88) |
5 | 122 (16) | 54/122 (44) | 54/122 (44) | 48/54 (89) |
All scores were ≥1 because all included patients were 3 to 15 years old.
Laboratory throat culture positive for GAS.
p = 0.09, χ2 test for trend for the frequency of heavy inoculum by McIsaac score.