Table 6 Risk factors for appendix perforation identified by univariate and multivariate logistic regression analysis

Gender

 Male

73

16

1.648

0.199

1.224 (0.447, 3.355)

 Female

86

11

Reference

Age, years

40.1 (14 ~ 81)

41.0 (17 ~ 78)

− 0.064

0.949

0.995 (0.966, 1.025)

First onset

 No

67

1

–

< 

0.166 (0.020, 1.419)

 Yes

92

26

0.001*

Reference

Time interval from on-set to operation, days

 ≤ 1

58

6

9.443

0.020*

0.210 (0.032, 1.379)

 1 < and ≤ 2

48

10

0.475 (0.081, 2.789)

 2 < and ≤ 3

14

8

1.584 (0.236, 10.637)

 > 3

33

3

Reference

Preoperative leukocyte count, × 10⁹/L

10.8 (2.1 ~ 24.3)

14.8 (2.7 ~ 22.8)

− 3.448

0.001*

1.074 (0.960, 1.201)

Preoperative neutrophil percentage, %

73.1 (30.5 ~ 95.8)

83.6 (60.3 ~ 94.1)

− 3.612

< 0.001*

1.074 (1.004, 1.150)

Preoperative US revealed periappendiceal fluid

 No

132

15

10.400

0.001*

0.594 (0.202, 1.749)

 Yes

24

11

Reference