Table 1.

The Atema score for clinical and CT features

	Points scored
Age ≥ 45 years	2
Body temperature (°C)
≤37.0	0
37.1–37.9	2
≥38.0	4
Duration of symptoms ≥ 48 h	2
WBC count > 13×109/l	2
C-reactive protein (mg/l)
≤50	0
51–100	2
>100	3
Extraluminal free air on CT	5
Periappendiceal fluid on CT	2
Appendicolith on CT	2
Maximum score	22

WBC, white blood cell.