Proportion of cases reporting frequent night-time and daytime symptoms by level of indoor exposures and associated odds ratios
| Frequent night-time symptoms | Frequent daytime symptoms | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Exposure | Level of exposure | n | No (%) positive | Adjusted OR* | 95% CI | n | No (%) positive | Adjusted OR* | 95% CI |
| *Adjusted for age, sex, and Carstairs deprivation index. | |||||||||
| CI, confidence interval; Mod, moderate; OR, odds ratio; VOCs, volatile organic compounds. | |||||||||
| Total VOCs (μg/m3) | 0 to 176 | 34 | 15 (44.1) | 1 | 34 | 21 (61.8) | 1 | ||
| 176.1 to 293 | 50 | 26 (52.0) | 1.46 | 0.58 to 3.63 | 48 | 32 (66.7) | 1.29 | 0.50 to 3.32 | |
| 293.1 to 506 | 25 | 15 (60.0) | 2.29 | 0.76 to 6.86 | 24 | 15 (62.5) | 1.18 | 0.39 to 3.62 | |
| >506 | 34 | 19 (55.9) | 1.65 | 0.61 to 4.43 | 34 | 22 (64.7) | 1.19 | 0.43 to 3.26 | |
| p Value | 0.64 | 0.51 | 0.97 | 0.96 | |||||
| p Trend | 0.28 | 0.26 | 0.91 | 0.82 | |||||
| Formaldehyde (μg/m3) | 0 to 16 | 39 | 16 (41.0) | 1 | 37 | 23 (62.2) | 1 | ||
| 16.1 to 22 | 35 | 17 (48.6) | 1.40 | 0.54 to 3.62 | 34 | 16 (47.1) | 0.47 | 0.17 to 1.25 | |
| 22.1 to 32 | 36 | 19 (52.8) | 1.61 | 0.62 to 4.19 | 37 | 27 (73.0) | 2.00 | 0.71 to 5.65 | |
| >32 | 33 | 22 (66.7) | 3.33 | 1.23 to 9.01 | 32 | 24 (75.0) | 2.08 | 0.71 to 6.11 | |
| p Value | 0.18 | 0.12 | 0.06 | 0.02 | |||||
| p Trend | 0.03 | 0.02 | 0.09 | 0.05 | |||||
| Living room damp | Very low | 32 | 13 (40.6) | 1 | 33 | 17 (51.5) | 1 | ||
| Low | 70 | 37 (52.9) | 2.02 | 0.81 to 5.04 | 68 | 47 (69.1) | 2.33 | 0.93 to 5.83 | |
| Mod/high | 24 | 16 (66.7) | 3.86 | 1.20 to 12.45 | 23 | 17 (73.9) | 3.23 | 0.97 to 10.78 | |
| p Value | 0.15 | 0.08 | 0.15 | 0.10 | |||||
| p Trend | 0.05 | 0.02 | 0.07 | 0.04 | |||||
| Kitchen damp | Very low | 25 | 9 (36.0) | 1 | 24 | 14 (58.3) | 1 | ||
| Low | 55 | 31 (56.4) | 2.49 | 0.90 to 6.89 | 55 | 38 (69.1) | 1.71 | 0.59 to 4.96 | |
| Mod/high | 23 | 15 (65.2) | 3.56 | 1.05 to 12.08 | 20 | 13 (65.0) | 1.37 | 0.38 to 5.00 | |
| p Value | 0.10 | 0.10 | 0.65 | 0.62 | |||||
| p Trend | 0.04 | 0.04 | 0.61 | 0.60 | |||||
| Bedroom damp | Very low | 45 | 16 (35.6) | 1 | 44 | 28 (63.6) | 1 | ||
| Low | 65 | 36 (55.4) | 2.32 | 1.04 to 5.16 | 64 | 40 (62.5) | 0.95 | 0.42 to 2.14 | |
| Mod/high | 14 | 11 (78.6) | 7.03 | 1.66 to 29.79 | 13 | 10 (76.9) | 1.72 | 0.41 to 7.32 | |
| p Value | 0.01 | 0.01 | 0.62 | 0.71 | |||||
| p Trend | 0.003 | 0.003 | 0.56 | 0.64 | |||||
| Cotinine | Absent | 113 | 57 (50.4) | 1 | 112 | 73 (65.2) | 1 | ||
| Present | 32 | 19 (59.4) | 1.22 | 0.52 to 2.87 | 30 | 19 (63.3) | 0.86 | 0.35 to 2.13 | |
| p Value | 0.37 | 0.65 | 0.85 | 0.74 | |||||
| NO2 (μg/m3) | 0 to 22 | 46 | 25 (54.3) | 1 | 45 | 31 (68.9) | 1 | ||
| 22.1 to 34 | 32 | 18 (56.3) | 0.95 | 0.37 to 2.48 | 32 | 22 (68.8) | 1.02 | 0.37 to 2.82 | |
| 34.1 to 58 | 34 | 17 (50.0) | 0.76 | 0.30 to 1.92 | 34 | 21 (61.8) | 0.67 | 0.25 to 1.78 | |
| >58 | 34 | 17 (50.0) | 0.77 | 0.30 to 1.96 | 32 | 19 (59.4) | 0.67 | 0.25 to 1.79 | |
| p Value | 0.94 | 0.91 | 0.78 | 0.74 | |||||
| p Trend | 0.61 | 0.50 | 0.32 | 0.32 | |||||