Study ID

Insignificant factors

Odds

Ratio

95% CI

p-value

Pre-operative phase

Chung 2015 [30]

Alcohol use

1.71

0.39 - 7.41

0.48

Leyngold 2012 [49]

Age > 60 years

0.44

0.05 - 3.62

0.45

Olsen 2016 [57]

Age 51 - 64 years

1.05

0.89 - 1.24

0.57

Rural vs urban residence

1.2

0.95 - 1.50

0.12

0 - 50th income quartile

1.01

0.85 - 1.20

0.92

Previous radiotherapy

1.17

0.82 - 1.68

0.38

Inflammatory breast disease

1.57

0.88 - 2.83

0.13

Teija-Kaisa 2012 [68]

Age ≥ 65

0.64

0.36 - 1.12

0.12

Pre-operative hospital stay ≥ 48 hrs

1.22

0.07 - 22.34

0.89

Non-intact skin condition

0.67

0.38 - 1.19

0.17

Intra-operative phase

Cooney 2016 [76]

Matching procedure

1.37

0.97 - 1.95

0.08

Franchelli 2012 [40]

TNM cancer stage II-IV

2.77

0.69 - 12.71

0.19

Leyngold 2012 [49]

Mastectomy

1.72

0.09 - 32.72

0.72

Olsen 2015 [56]

Brachytherapy catheter placement

1.42

0.75 - 2.68

0.28

Olsen 2017 [58]

Implant vs autologous IR

0.9

0.76 - 1.07

0.24

Ota 2016 [60]

Excisional biopsy

1.05

0.37 - 2.98

0.92

Simultaneous bilateral reconstruction

0.33

0.02 - 5.79

0.45

Tanner 2011 [67]

WLE + marker

1.84

0.52 - 6.52

0.35

Teija-Kaisa 2012 [68]

Invasive tumour marking

0.96

0.57 - 1.63

0.89

Duration of operation ≥ 87 mins

1.5

0.88 - 2.55

0.14

Giordano 2013 [81]

Combination of povidone-iodine

solution + antibiotic pocket irrigation

0.67

0.11 - 3.94

0.65

Golfam 2011 [82]

100% oxygen

0.2

0.01 - 4.08

0.3

Mittal 2017 [84]

Harmonic scalpel vs electrocautery

0.75

0.30 - 1.85

0.63

Williams 2011 [89]

Triclosan coated sutures

0.66

0.32 - 1.37

0.27

Post-operative phase

de Oliveira 2014 [78]

Active exercise

1.2

0.60 - 2.41

0.6

Dieterich 2013 [79]

Hydroxyethyl starch

0.89

0.46 - 1.73

0.73

Santosa 2016 [88]

Postmastectomy radiation therapy before exchange (TE radiotherapy) vs after permanent implant exchange

0.74

0.29 - 1.91

0.53