Table 5.
Exploratory univariable logistic regression of risk factors for complications
| Implant loss | Readmission | Reoperation | Infection | |||||
|---|---|---|---|---|---|---|---|---|
| Odds ratio | P | Odds ratio | P | Odds ratio | P | Odds ratio | P | |
| Age (per year) | 1.04 (1.00, 1.07) | 0.053 | 1.02 (1.00, 1.05) | 0.090 | 1.04 (1.01, 1.07) | 0.010 | 1.02 (0.99, 1.04) | 0.229 |
| Obesity (BMI ≥ 30 kg/m2) | 1.03 (0.40, 2.65) | 0.949 | 1.05 (0.53, 2.08) | 0.882 | 0.93 (0.45, 1.92) | 0.849 | 0.89 (0.45, 1.74) | 0.727 |
| Current smoking/nicotine use | 1.75 (0.62, 4.90) | 0.288 | 2.49 (1.20, 5.15) | 0.014 | 2.18 (1.02, 4.68) | 0.045 | 2.41 (1.18, 4.90) | 0.015 |
| Previous radiotherapy | 4.53 (1.63, 12.61) | 0.004 | 1.29 (0.46, 3.58) | 0.632 | 2.26 (0.89, 5.73) | 0.085 | 2.16 (0.89, 5.25) | 0.090 |
| Neoadjuvant chemotherapy | 1.33 (0.47, 3.76) | 0.586 | 0.47 (0.18, 1.25) | 0.132 | 0.56 (0.21, 1.49) | 0.244 | 0.73 (0.32, 1.66) | 0.452 |
| Bilateral surgery | 0.65 (0.24, 1.76) | 0.393 | 0.64 (0.32, 1.30) | 0.220 | 0.64 (0.31, 1.33) | 0.233 | 1.06 (0.57, 1.95) | 0.863 |
| At least one mastectomy for malignancy | 0.83 (0.27, 2.51) | 0.741 | 1.32 (0.53, 3.30) | 0.549 | 0.96 (0.40, 2.28) | 0.919 | 1.04 (0.46, 2.37) | 0.917 |
| Biological mesh | 2.62 (0.34, 20.03) | 0.354 | 3.19 (0.74, 13.8) | 0.121 | 1.26 (0.42, 3.77) | 0.681 | 0.74 (0.08, 7.28) | 0.799 |
| Duration of operation (per min) | 1.00 (0.99, 1.01) | 0.629 | 1.00 (1.00, 1.01) | 0.666 | 1.00 (0.99, 1.01) | 0.846 | 1.00 (0.99, 1.00) | 0.500 |
| Anticipated large implant (≥ 600 ml) | 3.20 (0.98, 10.48) | 0.055 | 1.71 (0.59, 4.95) | 0.321 | 2.32 (0.85, 6.38) | 0.102 | 2.56 (0.97, 6.75) | 0.058 |
| At least one nipple-sparing procedure (versus other mastectomy patterns) | 1.77 (0.77, 4.10) | 0.181 | 1.13 (0.64, 1.99) | 0.674 | 1.21 (0.69, 2.18) | 0.532 | 1.24 (0.72, 2.13) | 0.444 |
| Good skin-flap vascularity (versus average or poor) | 2.07 (0.88, 4.88) | 0.094 | 2.07 (1.11, 3.86) | 0.023 | 2.18 (1.15, 4.14) | 0.017 | 1.25 (0.66, 2.37) | 0.486 |
| Mastectomy weight ≤ 600 g (versus > 600 g) | 2.34 (1.01, 5.41) | 0.047 | 1.37 (0.71, 2.65) | 0.350 | 2.01 (1.05, 3.88) | 0.036 | 1.55 (0.83, 2.89) | 0.170 |
| Considered as being at moderate/high risk of complications before surgery* | 3.58 (1.54, 8.31) | 0.003 | 1.05 (0.59, 1.89) | 0.867 | 1.82 (1.00, 3.28) | 0.049 | 0.95 (0.54, 1.67) | 0.849 |
Values in parentheses are 95 per cent confidence intervals. *At least one risk factor from: high BMI, current smoking, previous radiotherapy, anticipated postmastectomy radiotherapy, anticipated implant volume exceeding 600 ml; or considered high risk by operating surgeon for another reason.