Table 3 Comparison of classroom and outdoor PM2.5 (µg/m³) annual averages and infiltration rates by treatment group.
From: Classroom air quality in a randomized crossover trial with portable HEPA air cleaners
PM2.5 (µg/m³) | Infiltration | ||||
|---|---|---|---|---|---|
HEPA | Non-HEPA | Outdoor | HEPA | Non-HEPA | |
School | Mean (SD) | Mean (SD) | Mean (SD) | Average Ratio (95% CI) | Average Ratio (95% CI) |
A | 1.921 (2.344) | 2.212 (1.272) | 10.061 (4.971) | 0.171 (0.129, 0.212) | 0.217 (0.181, 0.252) |
B | 0.461 (0.359) | 0.540 (0.414) | 9.237 (4.190) | 0.050 (0.029, 0.070) | 0.058 (0.046, 0.071) |
C | 0.351 (0.370) | 2.237 (2.214) | 8.152 (3.743) | 0.043 (0.035, 0.051) | 0.244 (0.167, 0.321) |
D | 0.810 (0.702) | 1.081 (0.845) | 9.901 (4.802) | 0.081 (0.056, 0.106) | 0.127 (0.105, 0.149) |
E | 0.538 (0.409) | 0.934 (0.671) | 7.780 (3.724) | 0.069 (0.048, 0.091) | 0.130 (0.110, 0.151) |
