Efficacy of graphene nanocomposites for air disinfection in dental clinics: A randomized controlled study

Table 2 PM_2.5 in clinic (μg/m³), mean ± SD

		Graphene group, group A	General group, group B	Blank group, group C	P value
Pre-treatment		28.30 ± 3.61	29.75 ± 4.19	29.55 ± 4.30
	Min-value	21	23	22	0.539
	Max-value	34	38	38
During		77.45 ± 9.82	117.10 ± 12.67	153.20 ± 8.78
	Min-value	53	101	135	0.000
	Max-value	92	150	168
Post-treatment		39.15 ± 7.24	71.26 ± 9.59	101.20 ± 5.12
	Min-value	20	58	90	0.000
	Max-value	49	90	112