TABLE 2.
Baseline data on SSI of patients in the training cohort
| All cases of training cohort | SSI | Non‐SSI | p‐value | ||
|---|---|---|---|---|---|
| No. of patients | No. of patients (% of total) | 238 (100) | 34 (14.3) | 204 (85.7) | |
| Sex | No. of patients (% of total) | .957 | |||
| Male | 104 (43.7) | 15 (44.1) | 89 (43.6) | ||
| Female | 134 (56.3) | 19 (55.9) | 115 (56.4) | ||
| Age | Years (median, IQR) | 68.00 (61.00, 74.25) | 70.00 (62.00, 78.00) | 67.00 (62.00, 78.00) | .09 |
| BMI | No. of patients (% of total) | .525 | |||
| <25 | 114 (47.9) | 18 (52.9) | 96 (47.1) | ||
| ≥25 | 124 (52.1) | 16 (47.1) | 108 (52.9) | ||
| Cardiovascular disease | No. of patients (% of total) | .823 | |||
| No | 81 (34.0) | 11 (32.4) | 70 (34.3) | ||
| Yes | 157 (66.0) | 23 (67.6) | 134 (65.7) | ||
| Number of fused vertebrae | No. of patients (% of total) | .001* | |||
| 1 | 81 (34.0) | 3 (8.8) | 78 (38.2) | ||
| ≥2 | 157 (66.0) | 31 (91.2) | 126 (61.8) | ||
| Operative time | minutes (median, IQR) | 170.00 (130.00, 200.00) | 180.00 (137.50, 232.50) | 170.00 (135.00, 200.00) | .675 |
| Intraoperative blood loss | ml (median, IQR) | 250.00 (150.00, 400.00) | 300.00 (200.00, 500.00) | 250.00 (150.00, 350.00) | .280 |
| Intraoperative blood transfusion | ml (median, IQR) | 200.00 (0.00, 300.00) | 250.00 (0.00, 500.00) | 200.00 (0.00, 250.00) | .337 |
| Length of the incision | cm (median, IQR) | 9.00 (8.00, 12.00) | 9.50 (8.00, 12.00) | 9.00 (8.00, 12.00) | .038* |
| Duration of drain placement | days (median, IQR) | 4.00 (3.00, 4.00) | 4.00 (3.75, 5.00) | 4.00 (3.00, 4.00) | .004* |
| Duration of diabetes (yr) | No. of patients (% of total) | .005* | |||
| ≤5 | 101 (42.4) | 7 (20.6) | 94 (46.1) | ||
| >5 | 137 (57.6) | 27 (79.4) | 110 (53.9) | ||
| HbA1c | % (median, IQR) | 7.34 (6.72, 7.34) | 7.34 (6.98, 7.85) | 7.34 (6.70, 7.34) | .402 |
| Preoperative blood glucose control scheme | No. of patients (% of total) | .012* | |||
| Subcutaneous injection of insulin | 50 (21.0) | 2 (5.9) | 48 (23.5) | ||
| Combined medication | 43 (18.1) | 11 (32.4) | 32 (15.7) | ||
| Oral hypoglycemic agent | 70 (29.4) | 7 (20.6) | 63 (30.9) | ||
| Diet therapy | 75 (31.5) | 14 (41.1) | 61 (29.9) | ||
| Preoperative MFBG | mmol/l (median, IQR) | 7.06 (6.04, 8.12) | 7.06 (6.05, 8.12) | 7.23 (6.38, 8.56) | .000* |
| Preoperative FPG‐CV | % (median, IQR) | 9.39 (5.47, 14.53) | 9.39 (5.47, 14.53) | 9.38 (5.48, 14.57) | .000* |
| Postoperative MFBG | mmol/l (median, IQR) | 7.73 (6.57, 8.78) | 7.73 (6.58, 8.78) | 7.70 (6.97, 9.02) | .537 |
| Postoperative FPG‐CV | % (median, IQR) | 13.35 (8.21, 19.28) | 21.41 (10.48, 33.10) | 12.68 (8.15, 16.87) | .001* |
Note: Continuous variables are presented as median (interquartile range; IQR), while categorical variables are presented as patients (%).
Abbreviations: FPG‐CV: variation coefficient of fasting plasma glucose; MFBG: mean fasting blood glucose.
*Statistically significant.