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The counts of PM in the operating rooms before surgery preparation
| Operating room | PM2.5* | P-value | Large PM* | P-value |
|---|---|---|---|---|
| A | 353.4 ± 335.2 | 0.760 | 0 ± 0 | 0.564 |
| B | 353.4 ± 335.2 | 353.4 ± 335.2 | ||
| C | 706.7 ± 447.0 | 0 ± 0 | ||
| D | 706.7 ± 670.4 | 706.7 ± 670.4 | ||
| E | 706.7 ± 670.4 | 0 ± 0 |
PM particulate matter
*Mean (counts/m3/min) ± standard error
