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Table 1 Influence of procedure-related operative characteristics on microbial colony counts assessed by active sampling in working operating rooms

From: Factors influencing microbial colonies in the air of 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  
  1. *cfu colony-forming units; #Surgery time = during incision to wound closure