Table 5 Diagnostic performance of CRP 1 and delta CRP depending on modified Alvarado score risk category
Low risk (MAS ≤ 4) n = 257 | High risk (MAS > 4) n = 243 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
(95% CI) | (95% CI) | |||||||||
Se | Sp | PPV | NPV | AUC | Se | Sp | PPV | NPV | AUC | |
Elevated admission CRP | 73 (65–80) | 58 (49–67) | 68 (60–76) | 63 (53–72) | 0.66 | 74 (67–80) | 43 (30–56) | 79 (72–85) | 36 (25–48) | 0.58 |
Delta CRP > 1 mg/L | 83 (76–89) | 23 (15–32) | 57 (50–64) | 53 (38–67) | 0.53 | 81 (74–86) | 25 (14–38) | 76 (69–82) | 30 (17–45) | 0.53 |