Table 1. Demographic characteristics.
| Variable | N (%) | ADM type = thin | ADM type = thick | P value |
|---|---|---|---|---|
| Sample, n (%) | 51 (100.0) | 21 (41.2) | 30 (58.8) | – |
| Age | 51 (100.0) | 48.05±11.17 | 49.47±9.22 | 0.622 |
| BMI | 51 (100.0) | 23.45±3.39 | 22.74±2.8 | 0.419 |
| Obesity | 51 (100.0) | 0.673 | ||
| BMI ≤25 kg/m2 | 38 (74.5) | 15 (71.4) | 23 (76.7) | |
| BMI >25 kg/m2 | 13 (25.5) | 6 (28.6) | 7 (23.3) | |
| HTN | 51 (100.0) | 0.214 (b) | ||
| No | 45 (88.2) | 17 (81) | 28 (93.3) | |
| Yes | 6 (11.8) | 4 (19) | 2 (6.7) | |
| Underlying disease | 51 (100.0) | 0.330 | ||
| No | 35 (68.6) | 16 (76.2) | 19 (63.3) | |
| Yes | 16 (31.4) | 5 (23.8) | 11 (36.7) | |
| PS direction | 51 (100.0) | 0.589 | ||
| L | 22 (43.1) | 10 (47.6) | 12 (40.0) | |
| R | 29 (56.9) | 11 (52.4) | 18 (60.0) | |
| ADM size | 51 (100.0) | 121.43±12.67 | 121.53±12.99 | 0.261 (a) |
| ADM size | 51 (100.0) | 0.103 (b) | ||
| 96 | 10 (19.6) | 4 (19) | 6 (20.0) | |
| 126 | 6 (11.8) | 5 (23.8) | 1 (3.3) | |
| 128 | 35 (68.6) | 12 (57.1) | 23 (76.7) | |
| Mastectomy type | 51 (100.0) | 0.096 (b) | ||
| ASM | 5 (9.8) | 4 (19) | 1 (3.3) | |
| NSM | 43 (84.3) | 15 (71.4) | 28 (93.3) | |
| SSM | 3 (5.9) | 2 (9.5) | 1 (3.3) | |
| Mastectomy weight | 51 (100.0) | 328.38±158.41 | 262.87±100.76 | 0.104 |
| Implant volume | 51 (100.0) | 281.9±118.29 | 250.17±85.28 | 0.300 |
| Adjuvant CTx | 51 (100.0) | 0.472 | ||
| Yes | 31 (60.8) | 14 (66.7) | 17 (56.7) | |
| No | 20 (39.2) | 7 (33.3) | 13 (43.3) | |
| Neo-adjuvant CTx | 51 (100.0) | 0.637 (b) | ||
| Yes | 46 (90.2) | 18 (85.7) | 28 (93.3) | |
| No | 5 (9.8) | 3 (14.3) | 2 (6.7) | |
| Radiotherapy | 51 (100.0) | 0.72 (b) | ||
| Yes | 42 (82.4) | 18 (85.7) | 24 (80.0) | |
| No | 9 (17.6) | 3 (14.3) | 6 (20.0) | |
| Endocrine therapy | 51 (100.0) | 1.000 (b) | ||
| Yes | 45 (88.2) | 19 (90.5) | 26 (86.7) | |
| No | 6 (11.8) | 2 (9.5) | 4 (13.3) | |
| ALND level | 51 (100.0) | 0.407 (b) | ||
| 0 | 31 (60.8) | 15 (71.4) | 16 (53.3) | |
| 1 | 2 (3.9) | 0 (0) | 2 (6.7) | |
| 2 | 18 (35.3) | 6 (28.6) | 12 (40.0) |
Continuous variables were expressed as mean ± SD. Categoric variables were expressed as sample number and %. When continuous variables were normally distributed, differences between subgroups were tested using Student’s t-test or Welch’s t-test. For non-normally distributed variables, the Mann-Whitney U test was used. For categoric variables, the Chi-squared test or Fisher’s exact test was used to compute P values. P value (a): computed using Mann-Whitney U test (i.e., Wilcoxon rank-sum test). P value (b): computed using Fisher’s exact test. ADM, acellular dermal matrix; ALND, axillary lymph node dissection; ASM, areolar-sparing mastectomy; BMI, body mass index; CTx, chemotherapy; HTN, hypertension; NSM, nipple-sparing mastectomy; SSM, skin-sparing mastectomy.