Table 2.

Model and scoring system combining ultrasound and clinical features amounting to a maximum score of 19 [21].

	Points
Clinical features
Age ≥45 years	2
Body temperature (°C) ≤37.0 37.1–37.9 ≥38.0	1 2 3
Duration of symptoms ≥48 h	2
WBC count >13 × 109/l	3
C-reactive protein (mg/l) ≤50 51–100 >100	1 2 3
Ultrasound features
Periappendiceal fluid	3
Presence of appendicolith	3