Table 5 Clinical outcomes by BMI cut-off at 30
From: Single use Negative Pressure Wound Therapy (NPWT) system in the management of knee arthroplasty
Clinical outcomes | BMI | |||||
|---|---|---|---|---|---|---|
< 30 | P value | ≥ 30 | P value | |||
NPWT (N = 128) | Conventional method (N = 39) | NPWT (N = 23) | Conventional method (N = 14) | |||
Blisters | Â | Â | Â | Â | Â | Â |
 Yes | 6 (60.0) (4.7) | 4 (40.0) (10.3) | 0.25 | 2 (50.0) (8.7) | 2 (50.0) (14.3) | 0.63 |
 No | 122 (77.7) (95.3) | 35 (22.3) (89.7) |  | 21 (63.6) (91.3) | 12 (36.4) (85.7) |  |
Main wound complications | N = 128 |  N = 39 |  |  N = 23 |  N = 14 |  |
 None | 128 (82.1) (100.0) | 28 (17.9) (71.8) | < 0.01* | 23 (69.7) (100.0) | 10 (30.3) (71.4) | 0.06 |
 Itchiness | 0 | 3 (100.0) (7.7) |  | 0 | 0 |  |
 Soiled | 0 | 4 (100.0) (10.3) |  | 0 | 2 (100.0) (14.3) |  |
 Wound review | 0 | 4 (100.0) (10.3) |  | 0 | 0 |  |
 Pain, rash, soaked or re-admitted | 0 | 0 |  | 0 | 2 (100.0) (14.3) |  |
Dressing change and reasons | N = 128 |  N = 39 |  |  N = 23 |  N = 14 |  |
 Yes | 1 (7.1) (0.8) | 13 (92.9) (33.3) | < 0.01* | 3 (75.0) (13.0) | 1 (25.0) (7.1) | 1.00 |
 No | 127 (83.0) (99.2) | 26 (17.0) (66.7) |  | 20 (60.6) (87.0) | 13 (39.4) (92.9) |  |
 Reasons | N = 1 |  N = 13 |  |  N = 3 |  N = 1 |  |
  Air leak | 0 | 0 | < 0.01* | 2 (100.0) (8.7) | 0 | 0.32 |
  Blisters | 0 | 1 (100.0) (7.7) |  | 0 | 0 |  |
  Machine wet | 1 (100.0) (0.8) | 0 |  | 1 (100.0) (4.3) | 0 |  |
  Wound review | 0 | 0 |  | 0 | 0 |  |
  Contaminated, itchiness, loosened | 0 | 5 (100.0) (38.5) |  | 0 | 0 |  |
  Change after shower, others | 0 | 7 (100.0) (53.8) |  | 0 | 1 (100.0) (7.1) |  |
 No | 127 (83.0) (99.2) | 26 (17.0) (66.7) |  | 20 (60.6) (87.0) | 13 (39.4) (92.9) |  |