Table 4 The analysis of the concentration number of formaldehyde detected at different time points.

From: Investigating surgical smoke in otolaryngology operating rooms

Sampling location

Detection time

Mean

Standard deviation

p-value

Main knife range

Beginning of the knife used

1.32

1.20

0.206

5–10 min after beginning

1.21

0.69

Outside the operation table

Beginning of the knife used

1.36

1.24

†0.068

5–10 min after beginning

1.15

0.87

  1. †0.05 < p < 0.1,*p < 0.05.
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