From: Factors influencing microbial colonies in the air of operating rooms
Variables | Number of samples n = 250 (%) | Mean bacterial count (cfu/m3)* | p-value |
---|---|---|---|
Indoor air temperature (°C), mean ± SD | 19.2 ± 0.9 | 0.101 | |
Indoor air relative humidity (%), mean ± SD | 59.1 ± 4.4 | 0.998 | |
Number of indoor staff, n | 6.2 ± 1.8 | 0.001 | |
2 persons | 6 (2.4) | 43.0 ± 46.3 | |
3 persons | 16 (6.4) | 57.6 ± 31.4 | |
4 persons | 16 (6.4) | 78.1 ± 41.1 | |
5 persons | 33 (13.2) | 75.0 ± 41.2 | |
6 persons | 73 (29.2) | 73.2 ± 43.7 | |
7 persons | 62 (24.8) | 76.4 ± 47.1 | |
8 persons | 32 (12.8) | 101.7 ± 52.9 | |
9 persons | 6 (2.4) | 109.7 ± 55.5 | |
10 persons and above | 6 (2.4) | 95–129 | |
Frequency of opening the operating room door during a surgical procedure | 0.231 | ||
< 5 | 133 (53.2) | 73.6 ± 46.8 | |
6–10 | 76 (30.4) | 80.7 ± 45.1 | |
> 10 | 41 (16.4) | 87.1 ± 49.4 | |
Sequence of the operation during the day | 0.690 | ||
First | 37 (14.8) | 69.4 ± 47.0 | |
Second | 56 (22.4) | 73.4 ± 43.8 | |
Third | 71 (28.4) | 84.1 ± 50.9 | |
Fourth | 46 (18.4) | 83.0 ± 49.1 | |
Fifth | 28 (11.2) | 73.8 ± 41.6 | |
Sixth and above | 12 (4.8) | 74–124 | |
Surgical stage at air microbial sampling | <0.001 | ||
before initial incision | 67 (26.8) | 99.9 ± 55.7 | |
during incision to wound closure | 170 (68.0) | 66.9 ± 38.3 | |
after wound closure | 13 (5.2) | 110 ± 46.6 | |
The time of sampling | 0.608 | ||
8:00–12:00 | 14 (5.6) | 66.6 ± 42.3 | |
12:01–16:00 | 116 (46.4) | 77.6 ± 48.9 | |
16:01–20:00 | 120 (48.0) | 79.7 ± 48.9 | |
Total air microbiologic sampling microbial colony counts | 78.0 ± 46.8 |