Table 2.

Distribution according to severity grades based on TG13 in the 171 patients who had definite, suspected, or unmatched AC diagnoses.

Combination of criteria	Grade I (n = 139)	Grade II (n = 20)	Grade III (n = 12)
Definite diagnosis
A + B + C (n = 84)	55 (65.5%)	18 (21.4%)	11 (13.1%)
Suspected diagnosis
A + B (n = 25)∗	25 (100%)	0	0
Unmatched diagnosis
(A or B) + C (n = 10)∗	7 (70.0%)	2 (20.0%)	1 (10.0%)
A (n = 41)∗	41 (100%)	0	0
B (n = 11)∗	11 (100%)	0	0

^∗These patients were also classified according to severity grades based on TG13 as a matter of convenience.

TG13: Tokyo Guidelines 2013 and AC: acute cholecystitis.