Table 1 Clinical characteristics of 186 cases with appendectomy

Gender, male/female

89 (47.8%)/ 97 (52.2%)

Age, < 40 / ≥ 40 years

101 (54.3%)/ 85 (45.7%)

Operation, LA/OA

155 (83.3%)/ 31 (16.7%)

First onset, yes/no

118 (63.4%)/ 68 (36.6%)

Time interval from the onset to operation, days

6 no record

 ≤ 1

64 (34.4%)

 1 < and ≤ 2

58 (31.2%)

 2 < and ≤ 3

22 (11.8%)

 > 3

36 (19.4%)

Time interval from initial onset to operation of recurrent patients, months

5 no record

 ≤ 3

9 (14.3%)

 3 < and ≤ 12

25 (39.7%)

 > 12

29 (46.0%)

Degree of intraoperative adhesions mild/middle/severe

92 (49.5%)/ 34 (18.3%)/ 60 (32.2%)

Intraoperative suppuration, yes/no

103 (55.4%)/ 83 (44.6%)

Intraoperative appendiceal perforation, yes/no

27 (14.5%)/ 159 (85.5%)

Operative time, mins

76 (20, 190)

Preoperative leukocyte count, × 10⁹/L

11.4 (2.1, 24.3)

Preoperative neutrophil percentage

74.6% (30.5%, 95.8%)

Preoperative US revealed periappendiceal fluid, yes/no

4 no record

35 (18.8%)/ 147 (79%)

Drainage tube, yes/no

115 (61.8%)/ 71 (38.2)

Pathology results, suppurative/ non-suppurative appendicitis

108 (58.1%)/ 78 (41.9%)