Table 3.

Mean and 95% confidence interval of PM in candles and incense according to filtration scenario by API and APII.

PM/Cases	Air purifier I				Air purifier II
	HEPA purifier OFF Mean (95% CI)	HEPA purifier ON Mean (95% CI)	% Decrease	P value	HEPA purifier ON Mean (95% CI)	HEPA purifier OFF Mean (95% CI)	% Decrease	P Value
PM0.25	0.39(0.36–0.42)	0.18 (0.16–0.21)	53	0.03	0.41 (0.39–0.42)	0.19 (0.17–0.22)	52	0.03
PM0.5	193.54 (175.06–212.02)	96.74 (81.77–111.72)	50	0.001	196.89 (187.16–206.62)	79.29 (68.94–89.65)	60	0.04
PM1.0	480.06 (428.99–531.13)	288.43 (238.56–338.29)	40	0.06	504.82 (470.50–539.15)	165.87 (138.92–192.81)	67	0.86
PM2.5	561.80 (502.91–620.70)	370.09 (306.34–433.83)	34	0.12	605.77 (564.04–647.50)	191.60 (160.33–222.87)	68	0.83
PM5.0	612.28 (552.59–671.96)	423.99 (356.09–491.89)	31	0.93	644.22 (602.52–685.92)	213.94 (182.49–245.39)	67	0.76
PM10	626.07 (566.25–685.90)	443.62 (373.85–513.40)	29	0.6	657.81 (616.26–699.36)	223.72 (192.19–255.24)	66	0.51

∗Statistical significance was a 5% level (p < 0.05).