Table 2.
Mean and 95% confidence interval of PM in general indoor air 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 | 0.06 (0.05–0.07) | 0.05 (0.04–0.06) | 13 | 0.07 | 0.07 (0.06–0.08) | 0.03 (0.01–0.04) | 64 | 0.14 |
| PM0.5 | 8.33 (7.86–8.79) | 7.33 (7.01–7.64) | 12 | 0.09 | 19.24 (18.65–19.83) | 5.10 (4.83–5.38) | 73 | 0.29 |
| PM1.0 | 15.35 (14.72–15.97) | 12.18 (11.77–12.59) | 21 | 0.04 | 25.50 (24.52–26.48) | 10.08 (9.32–10.83) | 60 | 0.11 |
| PM2.5 | 40.08 (38.80–41.35) | 22.98 (22.27–23.69) | 43 | 0.05 | 40.42 (35.37–45.47) | 25.27 (24.23–26.31) | 37 | 0.08 |
| PM5.0 | 116.07 (110.55–121.60) | 56.02 (53.51–58.53) | 52 | 0.19 | 119.75 (81.99–157.51) | 63.45 (61.30–65.60) | 47 | 0.02 |
| PM10 | 143.35 (135.56–151.15) | 69.11 (65.11–73.12) | 52 | 0.24 | 165.97 (103.62–228.33) | 76.78 (74.08–79.49) | 54 | 0.07 |
∗Statistical significance was a 5% level (p < 0.05).