Table 1.
Influence of procedure-related operative characteristics on microbial colony counts assessed by active sampling in working operating rooms
| Variables | Number of samples n = 250 (%) | Mean bacterial count (cfu/m3)* | p-value |
|---|---|---|---|
| Surgery time# (mean ± SD) | 2:53 ± 2:31 | 0.519 | |
| Surgery schedules | 0.143 | ||
| regular surgery | 220 (88.0) | 76.4 ± 45.8 | |
| urgent surgery | 30 (12.0) | 89.7 ± 53.1 | |
| Types of procedure | 0.012 | ||
| general surgery | 104(41.6) | 67.0 ± 44.7 | |
| urology surgery | 32(12.8) | 89.5 ± 43.9 | |
| colorectal surgery | 24(9.6) | 69.6 ± 37.5 | |
| neurosurgery | 23(9.2) | 80.0 ± 40.2 | |
| plastic surgery | 20(8.0) | 82.5 ± 55.7 | |
| orthopedics surgery | 19(7.6) | 92.5 ± 55.2 | |
| thoracic surgery | 16(6.4) | 84.1 ± 52.9 | |
| pediatric surgery | 9(3.6) | 115.0 ± 30.3 | |
| transplant surgery | 3 (1.2) | 123.0 ± 59.8 | |
| Site of surgery | 0.024 | ||
| superficial incision | 97(38.8) | 68.3 ± 46.4 | |
| deep incision | 54(21.6) | 88.3 ± 47.0 | |
| organ/space | 99(39.6) | 81.8 ± 45.8 | |
| Wound classification | 0.061 | ||
| clean | 132(52.8) | 72.1 ± 45.7 | |
| clean-contaminated | 65(26.0) | 88.3 ± 47.5 | |
| contaminated | 35(14.0) | 73.3 ± 39.9 | |
| dirty | 18(7.2) | 92.8 ± 58.0 |
*cfu colony-forming units; #Surgery time = during incision to wound closure