Four Centor criteria | 2.6 | (0.7 to 10.6) | 0.17 | 3.0 | (0.3 to 31.7) | 0.36 | 2.3 | (0.6 to 8.5) | 0.23 |
Three Centor criteria | 3.5 | (1.0 to 12.3) | 0.04 | 3.7 | (0.4 to 32.6) | 0.23 | 3.5 | (1.1 to 11.2) | 0.03 |
Two Centor criteria | 3.0 | (0.9 to 10.1) | 0.07 | 3.2 | (0.4 to 27.2) | 0.29 | 2.8 | (0.9 to 8.4) | 0.07 |
One Centor criterion | 1.9 | (0.5 to 7.0) | 0.34 | 3.5 | (0.4 to 31.7) | 0.26 | 2.0 | (0.6 to 6.5) | 0.26 |
Zero Centor criteria (reference) | 1.0 | | | 1.0 | | | 1.0 | | |
Rubor in pharynx | ns | | | ns | | | ns | | |
Considerable pain on swallowing | 2.5 | (1.4 to 4.5) | 0.003 | ns | | | 1.8 | (1.0 to 3.1) | 0.04 |
Mild/moderate pain (reference) | 1.0 | | | | | | 1.0 | | |
Duration of symptoms |
<4days | 2.0 | (1.1 to 3.5) | 0.02 | ns | | | 1.7 | (0.9 to 2.9) | 0.06 |
≥4 days (reference) | 1.0 | | | | | | 1.0 | | |
Age 3–14 years | 2.6 | (1.4 to 5.0) | 0.003 | ns | | | 2.1 | (1.1 to 3.9) | 0.02 |
Other ages (reference) | 1.0 | | | | | | 1.0 | | |
CRP >25 mg/l | ns | | | 2.5 | (0.9 to 6.6) | 0.07 | 1.1 | (0.5 to 2.1) | 0.84 |
CRP >50 mg/l | | | | 2.8 | (1.0 to 7.5) | 0.04 | 2.0 | (1.0 to 3.8) | 0.04 |
CRP <25 mg/l (reference) | | | | 1.0 | | | 1.0 | | |