Factor | Bacteria (cfu/m3)† | Fungi (cfu/m3)† | ||||
---|---|---|---|---|---|---|
B† | 95% CI (lower, upper) | Ba | 95% CI (lower, upper) | |||
Air change rate (h–1) | –71.30 | –87.54, –55.06 | <0.001*** | –71.64 | –88.09, –55.19 | <0.001*** |
Temperature (°C) | –5.54 | –14.77, 3.69 | 0.24 | –4.36 | –13.70, 4.99 | 0.36 |
Relative humidity (%) | 6.66 | 2.20, 11.12 | 0.004** | 6.07 | 1.53, 10.61 | 0.009** |
TB infection control score | –3.39 | –10.48, 3.07 | 0.35 | –4.77 | –11.89, 2.36 | 0.19 |
Daily number of patients with active TB (in each area) | –8.69 | –19.24, 1.85 | 0.11 | –9.03 | –19.66, 1.61 | 0.095 |
Daily number of occupants in each area | 1.81 | 0.75, 2.87 | 0.001** | 1.82 | 0.75, 2.89 | 0.001** |
Daily number of coughs by TB patients | 14.81 | 2.14, 27.47 | 0.022* | 10.40 | –2.56, 23.37 | 0.14 |
(not wearing a protective mask) Department‡ | ||||||
Emergency department | 130.49 | 72.77, 188.22 | <0.001*** | 133.59 | 75.50, 191.67 | <0.001*** |
TB clinic and bronchoscopy unit | 19.42 | –45.48, 84.33 | 0.55 | 1.68 | –63.95, 67.30 | 0.96 |
Ventilation system§ | ||||||
Central-type air conditioner | 166.08 | 102.63, 229.53 | <0.001*** | 164.41 | 100.03, 228.78 | <0.001*** |
Split-type air conditioner | –46.27 | –105.46, 12.93 | 0.12 | –53.67 | –113.17, 5.84 | 0.077 |
Factors | Bacteria (cfu/m3)† | Fungi (cfu/m3)† | ||||
---|---|---|---|---|---|---|
B† | 95% CI (lower, upper) | B† | 95% CI (lower, upper) | |||
Air change rate (h–1) | –50.48 | –64.99, –35.97 | <0.001*** | –51.57 | –66.66, –36.48 | <0.001*** |
Relative humidity (%) | 7.27 | 4.25, 10.29 | <0.001*** | 6.59 | 3.44, 9.73 | <0.001*** |
Emergency department‡ | 65.05 | 21.99, 108.12 | 0.003** | 68.37 | 23.58, 113.15 | 0.003** |
Central-type air conditioner§ | 113.90 | 63.60, 164.19 | 0.001** | 107.38 | 55.08, 159.68 | <0.001*** |
Constant | 429.84 | 191.73, 667.96 | 0.001 | 405.80 | 158.18, 653.42 | 0.002 |
Data for TB high-risk areas Median (IQR), unless indicated otherwise | Emergency department (n = 27) | TB ward (n = 47) | Bronchoscopy unit (n = 7) | TB clinic (n = 18) | All areas (n = 99) |
---|---|---|---|---|---|
Air change rate (h–1) | 6.0 (5.9–6.2) | 6.7 (6.1–7.3) | 7.0 (5.2–7.1) | 6.3 (5.2–7.0) | 6.2 (6.0–7.1) |
Temperature (°C) | 25.6 (25.1–27.1) | 31.5 (29.1–32.0) | 24.6 (24.2–25.7) | 28.3 (26.3–30.7) | 27.9 (25.3–31.5) |
Relative humidity (%) | 61.7 (60.0–63.7) | 66.7 (57.8–70.1) | 57.2 (53.8–66.3) | 68.2 (58.2–70.6) | 62.2 (57.8–70.0) |
TB infection control score† | 24.0 (21.0–28.0) | 26.0 (22.0–28.0) | 21.0 (14.0–25.0) | 27.0 (23.8–28.0) | 26.0 (22.0–28.0) |
Good level, frequency (%) | 23.0 (85.2) | 37.0 (78.7) | 4.0 (57.1) | 16.0 (88.9) | 80.0 (80.8) |
Moderate level, frequency (%) | 4.0 (14.8) | 10.0 (21.3) | 3.0 (42.9) | 2.0 (11.1) | 19.0 (19.2) |
Daily number of occupants in each area | 35.0 (15.0–60.0) | 7.0 (5.0–10.0) | 6.0 (5.0–15.0) | 20.0 (6.8–69.3) | 10.0 (5.0–30.0) |
Daily number of active TB patient(s) in each area | – | 1.0 (1.0–1.0) | 1.0 (0.0–1.0) | 2.0 (1.0–7.0) | 1.0 (0.0–1.0) |
Daily number of coughs by TB patient(s) not | 1.0 (0.0–1.0) | 3.0 (1.0–3.0) | – | 0.0 (0.0–1.0) | |
wearing a protective mask in each area | |||||
Ventilation system | |||||
Natural ventilation, frequency (%) | 2.0 (7.4) | 37.0 (78.7) | – | 8.0 (44.4) | 47.0 (47.5) |
Central-type air conditioner, frequency (%) | 12.0 (44.4) | – | – | 7.0 (38.9) | 19.0 (19.2) |
Split-type air conditioner, frequency (%) | 13.0 (48.2) | 10.0 (21.3) | 7.0 (100.0) | 3.0 (16.7) | 33.0 (33.3) |
Indoor airborne bacteria (cfu/m3)‡ | 691.0 ± 79.61 | 533.8 ± 132.50 | 567.9 ± 208.55 | 627.2 ± 124.60 | 596.1 ± 140.90 |
Indoor airborne fungi (cfu/m3)‡ | 618.4 ± 108.03 | 464.7 ± 130.11 | 478.1 ± 178.01 | 539.7 ± 129.59 | 521.2 ± 142.20 |