Table 3 The analysis of the concentration number of particulate matter detected during the use of electrocautery knife at different locations.

Detection time	Particulate matter size	Sampling location	Mean	Standard deviation	p-value
Beginning of the knife used	0.3 μm	Main knife range	4.83*10⁵	1.51*10⁶	^†0.061
	0.3 μm	Outside the operation table	4.97*10⁴	8.70*10⁴	^†0.061
	0.5 μm	Main knife range	2.12*10⁵	8.21*10⁵	^†0.096
	0.5 μm	Outside the operation table	1.02*10⁴	1.38*10⁴	^†0.096
	5.0 μm	Main knife range	1.80*10³	4.58*10³	^†0.054
	5.0 μm	Outside the operation table	3.91*10²	4.67*10²	^†0.054
5–10 min after beginning	0.3 μm	Main knife range	2.12*10⁵	7.83*10⁵	^†0.094
	0.3 μm	Outside the operation table	2.13*10⁴	6.47*10⁴	^†0.094
	0.5 μm	Main knife range	9.96*10⁴	3.60*10⁵	^†0.083
	0.5 μm	Outside the operation table	6.48*10³	1.82*10⁴	^†0.083
	5.0 μm	Main knife range	2.97*10³	1.33*10⁴	0.163
	5.0 μm	Outside the operation table	5.30*10²	7.73*10²	0.163

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