Author

Design

SSI group

Non-SSI group

Finding risk factors/Result

Infection rate (%)

Mehta et al.

Retrospective Cohort

24

298

BMI

8.0

Haleem et al.

Retrospective Case control

54

2309

Obesity, hypertension

2.3

Klemencsics et al.

Prospective Cohort

25/12

723/307

Old ages, BMI

3.5/3.9

Kobayashi et al.

Retrospective Case Series

14

384

BMI, mGPS

3.6

Olsen et al.

Retrospective Case Control

46

2316

Diabetes

2.0

Peng et al.

Retrospective Case Control

37

523

Diabetes, BMI

7.1

Bohl et al.

Retrospective Case Series

-

-

Malnutrition, SSI (n = 43,100 RR: 2.3 P = 0.01)

-

Sorensen, L. T.

Review cohort and randomized control trail.

-

-

Smoking, smoker and non smoker were compared in 140 cohort n = 479,150, SSI (OR = 1.79, 95%CI = 1.57 − 2.24); In 4 RCT studies smoking cessation reduce SSI (OR = 0.43 95%CI = 0.21 − 0.85)

-

Kim et al.

Retrospective cohort

-

-

Surgical duration more than 5 hours increase the risk of SSI (Table 2)

Rechtine, G et al.

Retrospective Case Series

12

117

Trauma

10.0

Ranson et al.

Retrospective Cohort

-

-

Chronic Steroid user (N = 849 OR = 8.13 P = 0.001)

-

Mueller et al.

Retrospective Case series

21

1442

Minimal invasive surgery (MIS) has lower rate of SSI compare to open surgery. Total SSI is 21, MIS 5, Open 16, P = 0.002

1.5