Table 3.

Primary outcome measure: duration of antibiotics (median with interquartile range, days).

Duration antibiotic treatment	Procalcitonin (n = 79)	Control (n = 83)	p value
(i) All patients	8 (5–16)	10 (6–12)	0.714
(ii) Subgroup 1: GI perforation	7 (5–12)	10 (8.5–12)	0.065
(iii) Subgroup 2: appendicitis	8 (5.5–13.5)	8 (5–11)	0.573
(iv) Subgroup 3: postoperative	18.5 (6.75–29.5)	13 (11–18)	0.403