Table 1.
Comparisons of demographic, perioperative and laboratory indicators between SSI and Non-SSI patients in the training and validation set.
| Variables | Training set | Validation set | ||||
|---|---|---|---|---|---|---|
| SSI | Non-SSI | P-value | SSI | Non-SSI | P-value | |
| (N = 165) | (N = 341) | (N = 76) | (N = 141) | |||
| Demographic Indicators | ||||||
| Gender | 0.20 | 1.00 | ||||
| Female | 79 (47.88%) | 141 (41.35%) | 34 (44.74%) | 64 (45.39%) | ||
| Male | 86 (52.12%) | 200 (58.65%) | 42 (55.26%) | 77 (54.61%) | ||
| Age | 0.001 | 0.21 | ||||
| <60 years | 98 (59.39%) | 253 (74.19%) | 52 (68.42%) | 109 (77.30%) | ||
| ≥ 60 years | 67 (40.61%) | 88 (25.81%) | 24 (31.58%) | 32 (22.70%) | ||
| Smoke status | 0.72 | 0.03 | ||||
| Never | 107 (64.85%) | 214 (62.76%) | 41 (53.95%) | 99 (70.21%) | ||
| Ever/current | 58 (35.15%) | 127 (37.24%) | 35 (46.05%) | 42 (29.79%) | ||
| Drink status | 0.35 | 0.72 | ||||
| Never | 134 (81.21%) | 263 (77.13%) | 58 (76.32%) | 103 (73.05%) | ||
| Ever/current | 31 (18.79%) | 78 (22.87%) | 18 (23.68%) | 38 (26.95%) | ||
| HBP | 0.63 | 0.03 | ||||
| No | 109 (66.06%) | 234 (68.62%) | 47 (61.84%) | 108 (76.60%) | ||
| Yes | 56 (33.94%) | 107 (31.38%) | 29 (38.16%) | 33 (23.40%) | ||
| DM | 0.001 | 0.001 | ||||
| No | 97 (58.79%) | 251 (73.61%) | 40 (52.63%) | 106 (75.18%) | ||
| Yes | 68 (41.21%) | 90 (26.39%) | 36 (47.37%) | 35 (24.82%) | ||
| BMI | <0.001 | 0.004 | ||||
| <28 kg/m2 | 51 (30.91%) | 185 (54.25%) | 25 (32.89%) | 77 (54.61%) | ||
| ≥ 28 kg/m2 | 114 (69.09%) | 156 (45.75%) | 51 (67.11%) | 64 (45.39%) | ||
| Perioperative indicators | ||||||
| MS: | 0.96 | 0.10 | ||||
| No | 115 (69.70%) | 240 (70.38%) | 47 (61.84%) | 104 (73.76%) | ||
| Yes | 50 (30.30%) | 101 (29.62%) | 29 (38.16%) | 37 (26.24%) | ||
| Implant | 0.15 | 0.10 | ||||
| No | 18 (10.91%) | 55 (16.13%) | 9 (11.84%) | 31 (21.99%) | ||
| Yes | 147 (89.09%) | 286 (83.87%) | 67 (88.16%) | 110 (78.01%) | ||
| OT: | 0.03 | 0.56 | ||||
| < 3 h | 78 (47.27%) | 197 (57.77%) | 47 (61.84%) | 80 (56.74%) | ||
| ≥ 3 h | 87 (52.73%) | 144 (42.23%) | 29 (38.16%) | 61 (43.26%) | ||
| IBL | 0.09 | 1.00 | ||||
| < 200 ml | 144 (87.27%) | 315 (92.38%) | 68 (89.47%) | 127 (90.07%) | ||
| ≥ 200 ml | 21 (12.73%) | 26 (7.62%) | 8 (10.53%) | 14 (9.93%) | ||
| PSD | <0.001 | <0.001 | ||||
| < 300 ml | 21 (12.73%) | 165 (48.39%) | 12 (15.79%) | 70 (49.65%) | ||
| ≥ 300 ml | 144 (87.27%) | 176 (51.61%) | 64 (84.21%) | 71 (50.35%) | ||
| GS | <0.001 | 0.005 | ||||
| No | 12 (7.27%) | 84 (24.63%) | 4 (5.26%) | 29 (20.57%) | ||
| Yes | 153 (92.73%) | 257 (75.37%) | 72 (94.74%) | 112 (79.43%) | ||
| PTAG | 0.60 | 0.37 | ||||
| No | 43 (26.06%) | 98 (28.74%) | 18 (23.68%) | 43 (30.50%) | ||
| Yes | 122 (73.94%) | 243 (71.26%) | 58 (76.32%) | 98 (69.50%) | ||
| NPTA | 0.009 | 0.02 | ||||
| No | 110 (66.67%) | 266 (78.01%) | 45 (59.21%) | 106 (75.18%) | ||
| Yes | 55 (33.33%) | 75 (21.99%) | 31 (40.79%) | 35 (24.82%) | ||
| Laboratory indicators | ||||||
| PTHB | 0.32 | 0.09 | ||||
| Normal | 57 (34.55%) | 135 (39.59%) | 32 (42.11%) | 42 (29.79%) | ||
| Abnormal | 108 (65.45%) | 206 (60.41%) | 44 (57.89%) | 99 (70.21%) | ||
| PTSA | 0.004 | 0.002 | ||||
| Normal | 91 (55.15%) | 234 (68.62%) | 36 (47.37%) | 98 (69.50%) | ||
| Abnormal | 74 (44.85%) | 107 (31.38%) | 40 (52.63%) | 43 (30.50%) | ||
| LKF | 0.71 | 0.09 | ||||
| Normal | 67 (40.61%) | 146 (42.82%) | 40 (52.63%) | 56 (39.72%) | ||
| Abnormal | 98 (59.39%) | 195 (57.18%) | 36 (47.37%) | 85 (60.28%) | ||
| K+ | 0.001 | 0.65 | ||||
| Normal | 43 (26.06%) | 141 (41.35%) | 27 (35.53%) | 56 (39.72%) | ||
| Abnormal | 122 (73.94%) | 200 (58.65%) | 49 (64.47%) | 85 (60.28%) | ||
| Ca+ | 0.18 | 0.37 | ||||
| Normal | 96 (58.18%) | 221 (64.81%) | 43 (56.58%) | 90 (63.83%) | ||
| Abnormal | 69 (41.82%) | 120 (35.19%) | 33 (43.42%) | 51 (36.17%) | ||
| TT | <0.001 | <0.001 | ||||
| Normal | 56 (33.94%) | 251 (73.61%) | 39 (51.32%) | 108 (76.60%) | ||
| Abnormal | 109 (66.06%) | 90 (26.39%) | 37 (48.68%) | 33 (23.40%) | ||
SSI surgical site infection, HBP high blood pressure, DM diabetes mellitus, BMI body mass index, MS multi-stage surgery, OT operation time, IBL intraoperative blood loss, PSD postoperative suction drainagen, GS gelatin sponge, PTAG postoperative anticoagulation, NPTA none-preoperative antibiotic, PTHB postoperative hemoglobin, PTSA postoperative serum albumin, LKF liver and kidney function, TT thrombin time. Categorical variables were presented as number and percentage (n, %). The bold text means that the P value was < 0.05.