71 Implant loss and associated risk factors following implant-based breast reconstruction surgical characteristics for individual implant-based breast reconstructions with and without implant loss are summarized in Table 2. Table 2. Preoperative and surgical characteristics Baseline characteristics of the overall group and stratified for implant loss. Data are n (%) or median (range). Preoperative characteristics Total (n = 297) No implant loss (n = 262) Implant loss (n = 35) p-value* Age, years 48 (22–72) 48 (22–72) 50 (25–66) 0.863 BMI, L2/m 24.3 (16.5–44.1) 24.1 (16.5–39.9) 27.3 (17.6–44.1) 0.007 Cup size 0.012 A, B ,C 166 (55.9) 152 (58) 14 (40) D, E, F, H 88 (29.6) 71 (27.1) 17 (48.6) Missing 43 (14.5) 39 (14.9) 4 (11.4) ASA score 0.143 1–2 278 (93.6) 243 (92.7) 35 (100.0) 3–4 19 (6.4) 19 (7.3) 0 (0.0) Comorbidity 93 (31.3) 80 (30.5) 13 (37.1) 0.428 Current smoker 47 (15.8) 35 (13.4) 12 (34.3) 0.002 Missing 7 (2.4) 7 (2.7) 0 (0.0) Indication surgery 0.581 Preventive 86 (29.0) 74 (28.2) 12 (34.3) Invasive carcinoma 151 (50.8) 136 (51.9) 8 (22.9) DCIS 55 (18.5) 47 (17.9) 15 (42.9) Other 5 (1.7) 5 (1.9) 0 (0.0) Neoadjuvant chemotherapy 87 (29.3) 78 (29.8) 9 (25.7) 0.594 Missing 11 (3.7) 10 (3.8) 1 (2.9) Surgical characteristics Total (n = 297) No Implant loss (n = 262) Implant loss (n = 35) p-value* Operative time 137 (36–300) 135 (36–300) 170 (47–263) < 0.001 Weight resected specimen 397 (39–1300) 385 (39–1245) 571 (166–1300) 0.003 Mastectomy type 0.002 Nipple-sparing 119 (40.1) 97 (37.0) 22 (62.8) Skin-sparing 175 (58.9) 163 (62.2) 12 (34.3) Missing 3 (1.0) 2 (0.8) 1 (2.9) Sentinel node 183 (61.6) 163 (62.2) 20 (57.1) 0.662 5
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