Estimated ORs (95% CIs) and variance components for respiratory symptoms from multilevel logistic regression models for secondary school pupils (n=3410, 30 school buildings)
| Respiratory symptoms reported in general | Respiratory symptoms reported in relation to school | |||||
| Model 1 | Model 2 | Model 3 | Model 1 | Model 2 | Model 3 | |
| Building-related variables (school level) | ||||||
| Good IEQ | 1.00 | 1.00 | 1.00 | 1.00 | ||
| Moderate IEQ | 0.99 (0.73 to 1.36) | 0.88 (0.67 to 1.15) | 1.15 (0.65 to 2.02) | 0.81 (0.54 to 1.22) | ||
| Poor IEQ | 1.23 (0.89 to 1.69) | 0.95 (0.70 to 1.29) | 1.56 (0.87 to 2.79) | 0.80 (0.50 to 1.27) | ||
| Psychosocial variables (individual level) | ||||||
| Worry about IEQ | 1.60 (1.46 to 1.74) | 1.59 (1.46 to 1.74) | 2.06 (1.82 to 2.34) | 2.06 (1.82 to 2.34) | ||
| Neuroticism | 1.12 (1.00 to 1.26) | 1.12 (1.00 to 1.26) | 1.00 (0.84 to 1.18) | 1.00 (0.84 to 1.18) | ||
| Conscientiousness | 0.82 (0.71 to 0.95) | 0.82 (0.71 to 0.95) | 0.84 (0.68 to 1.04) | 0.84 (0.68 to 1.04) | ||
| Extraversion | 1.10 (0.98 to 1.23) | 1.10 (0.98 to 1.23) | 1.28 (1.08 to 1.51) | 1.28 (1.08 to 1.52) | ||
| Openness | 1.12 (0.99 to 1.27) | 1.12 (0.99 to 1.27) | 1.00 (0.84 to 1.19) | 1.00 (0.84 to 1.19) | ||
| Agreeableness | 0.86 (0.74 to 1.01) | 0.86 (0.74 to 1.01) | 0.84 (0.67 to 1.06) | 0.84 (0.66 to 1.06) | ||
| Low school satisfaction | 1.24 (1.06 to 1.44) | 1.24 (1.06 to 1.44) | 1.05 (0.84 to 1.32) | 1.05 (0.84 to 1.31) | ||
| Home satisfaction | ||||||
| 0 (high) | 1.00 | 1.00 | 1.00 | 1.00 | ||
| 1 (moderate) | 1.19 (0.94 to 1.50) | 1.19 (0.94 to 1.51) | 0.75 (0.52 to 1.10) | 0.75 (0.52 to 1.11) | ||
| 2 (low) | 1.19 (0.81 to 1.75) | 1.19 (0.81 to 1.76) | 1.07 (0.61 to 1.86) | 1.07 (0.61 to 1.86) | ||
| Having friends to spend time with | ||||||
| 0 (often) | 1.00 | 1.00 | 1.00 | 1.00 | ||
| 1 (more or less often) | 1.20 (0.93 to 1.55) | 1.20 (0.93 to 1.55) | 1.30 (0.89 to 1.89) | 1.29 (0.88 to 1.87) | ||
| 2 (rare) | 1.32 (0.95 to 1.81) | 1.31 (0.95 to 1.81) | 1.46 (0.91 to 2.35) | 1.45 (0.90 to 2.34) | ||
| Psychosocial variables (school level) | ||||||
| Worry about IEQ reported by principals | 1.04 (0.92 to 1.19) | 1.07 (0.91 to 1.27) | 1.27 (0.84 to 1.32) | 1.37 (1.09 to 1.72) | ||
| Variance between schools, σ2u | 0.044 | 0 | 0 | 0.218 | 0 | 0 |
| PCV* | 20% | 100% | 100% | 18% | 100% | 100% |
| ICC | 0.013 | 0.000 | 0.000 | 0.062 | 0.000 | 0.000 |
| MOR | 1.22 | 1.00 | 1.00 | 1.56 | 1.00 | 1.00 |
Model 1 includes random intercept and school indoor environmental quality (IEQ).
Model 2 includes random intercept and all psychosocial factors.
Model 3 includes random intercept, school IEQ and all psychosocial factors.
All models are adjusted for individual and allergic characteristics. The estimates highlighted in bold are statistically significant at p<0.05.
*Proportional change of variance (PCV) was calculated as (σ2u of the model adjusted for individual characteristics − σ2u of the model of interest (model 1, 2 or 3))/σ2u of the model adjusted only for individual characteristics.
ICC, intraclass correlation; MOR, median OR.