Table 3.
Univariate analysis on the continuous variables: only the length of hospital stay before the operation (days) was associated with SSI after the operation to correct femoral fractures (July 2007–July 2009).
| Variable | SSI | Number of patients | Mean | Median | Standard deviation | p value |
|---|---|---|---|---|---|---|
| Length of hospital stay before operation (days) | Yes | 9 | 31 | 21 | 24.9 | 0.008 |
| No | 193 | 13 | 8 | 18.8 | ||
| Age (years) | Yes | 21 | 63 | 73 | 27.5 | 0.329 |
| No | 411 | 57 | 66 | 27.3 | ||
| Duration of operation (h) | Yes | 21 | 2:14 | 1:44 | 0.1 | 0.365 |
| No | 411 | 1:49 | 1:39 | 0 | ||
| Hemoglobin | Yes | 19 | 11.0 | 10.6 | 1.2 | 0.298 |
| No | 387 | 11.4 | 11.3 | 2 | ||
| Hematocrit | Yes | 19 | 33.0 | 32.5 | 4.1 | 0.323 |
| No | 387 | 34.3 | 33.9 | 6 | ||
| Glycemia | Yes | 11 | 122.2 | 106.0 | 34.7 | 0.913 |
| No | 167 | 126.9 | 114.0 | 62 |
SSI, surgical site infection.