Environmental characteristics in stores, by intervention group and visit
| GM (GSD) | Range | No intervention | Intervention | p* visit | p* group | p* visit × group | |||
|---|---|---|---|---|---|---|---|---|---|
| Visit 1 | Visit 2 | Visit 1 | Visit 2 | ||||||
| *Analysis of variance for unbalanced data, visit effect/group effect/visit×group interaction. | |||||||||
| †5-minute area samples. | |||||||||
| ‡Inhalable particulate matter, full shift personal air samples. | |||||||||
| §Extracted from particulate matter filters. | |||||||||
| Number of stores visited | 72 (36 stores visited 2× each) | 19 | 19 | 17 | 17 | ||||
| Outdoor environment | |||||||||
| Temperature, °C (mean, SD) | 11.0 (5.8) | −8.0, 25.0 | 15.3 | 7.3 | 15.2 | 7.5 | <0.0001 | 0.9 | 0.9 |
| Viable fungal counts† (store average, GM (GSD)) | 444 (2.7) | 18, 5218 | 567 (2.3) | 326 (3.1) | 623 (1.9) | 342 (3.2) | 0.01 | 0.8 | 0.9 |
| IPM concentration‡ (mg/m3, GM (GSD)) | 0.044 (2.7) | 0.005, 0.152 | 0.038 (2.2) | 0.052 (2.5) | 0.038 (2.1) | 0.052 (2.7) | 0.1 | 0.9 | 0.9 |
| Endotoxin concentration§ (EU/m3, GM (GSD)) | 0.38 (3.0) | 0.08, 24.1 | 0.36 (2.4) | 0.45 (3.8) | 0.36 (2.7) | 0.36 (3.5) | 0.6 | 0.7 | 0.7 |
| Indoor environment | |||||||||
| Temperature, °C (mean, SD) | 17.7 (2.5) | 13.0, 26.5 | 18.6 | 17.1 | 18.7 | 16.4 | 0.001 | 0.5 | 0.5 |
| Absolute humidity (lb water per lb air, mean, SD) | 0.0073 (0.001) | 0.0046, 0.01 | 0.008 (0.001) | 0.0067 (0.001) | 0.008 (0.001) | 0.0066 (0.001) | <0.0001 | 0.6 | 0.9 |
| Viable fungal counts† (store average, GM (GSD)) | 1064 (3.1) | 102, 8136 | 1669 (2.8) | 626 (2.4) | 1634 (3.4) | 757 (3.2) | 0.0009 | 0.7 | 0.7 |
| Personal air samples, subjects with one test only | |||||||||
| Number of samples | 182 | 56 | 45 | 44 | 37 | ||||
| IPM concentration‡ (mg/m3, GM (GSD)) | 0.176 (1.9) | <0.0007, 1.84 | 0.172 (1.6) | 0.187 (2.1) | 0.161 (2.5) | 0.191 (1.7) | 0.2 | 0.8 | 0.6 |
| Endotoxin concentration§ (EU/m3, GM (GSD)) | 3.6 (3.1) | < 0.14, 179.6 | 2.7 (2.8) | 4.6 (3.0) | 3.0 (2.6) | 5.8 (3.8) | 0.04 | 0.3 | 0.7 |
| Personal air samples, subjects with repeated visits | |||||||||
| Number of samples | 88 | 22 | 22 | 22 | 22 | ||||
| IPM concentration‡ (mg/m3, GM (GSD)) | 0.184 (1.6) | 0.031, 0.684 | 0.163 (1.6) | 0.191 (1.9) | 0.178 (1.6) | 0.206 (1.4) | 0.1 | 0.4 | 0.9 |
| Endotoxin concentration§ (EU/m3, GM (GSD)) | 4.3 (2.9) | 0.36, 104.8 | 2.9 (1.1) | 5.3 (3.1) | 3.8 (3.1) | 5.9 (2.4) | 0.02 | 0.4 | 0.7 |