Estimated ORs (95% CIs) and variance components for respiratory symptoms from multilevel logistic regression models for parents of primary school pupils (n=3540, 88 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 | 1.13 (0.86 to 1.49) | 0.86 (0.64 to 1.15) | 2.50 (1.52 to 4.13) | 1.58 (0.92 to 2.71) | ||
| Poor IEQ | 1.61 (1.18 to 2.19) | 0.95 (0.65 to 1.37) | 4.19 (2.42 to 7.24) | 1.67 (0.89 to 3.14) | ||
| Psychosocial variables (individual level) | ||||||
| Worry about IEQ | 1.94 (1.77 to 2.14) | 1.94 (1.77 to 2.14) | 3.11 (2.64 to 3.66) | 3.08 (2.62 to 3.63) | ||
| Low school satisfaction | 1.25 (1.03 to 1.52) | 1.25 (1.03 to 1.52) | 1.29 (0.96 to 1.75) | 1.30 (0.96 to 1.76) | ||
| Home satisfaction | ||||||
| 0 (high) | 1.00 | 1.00 | 1.00 | 1.00 | ||
| 1 (moderate) | 1.01 (0.77 to 1.33) | 1.01 (0.77 to 1.33) | 0.89 (0.57 to 1.39) | 0.88 (0.56 to 1.39) | ||
| 2 (low) | 0.99 (0.53 to 1.85) | 1.00 (0.54 to 1.87) | 0.53 (0.19 to 1.51) | 0.55 (0.19 to 1.56) | ||
| Having friends to spend time with | ||||||
| 0 (often) | 1.00 | 1.00 | 1.00 | 1.00 | ||
| 1 (more or less often) | 1.07 (0.81 to 1.41) | 1.07 (0.81 to 1.41) | 1.29 (0.84 to 1.99) | 1.30 (0.84 to 2.01) | ||
| 2 (rare) | 1.27 (0.83 to 1.94) | 1.26 (0.82 to 1.92) | 1.17 (0.58 to 2.34) | 1.19 (0.59 to 2.39) | ||
| Psychosocial variables (school level) | ||||||
| Worry about IEQ reported by principals | 0.99 (0.85 to 1.16) | 1.02 (0.83 to 1.25) | 1.27 (0.99 to 1.63) | 1.06 (0.77 to 1.46) | ||
| Variance between schools, σ2u | 0.063 | 0.004 | 0.001 | 0.204 | 0.053 | 0.031 |
| PCV* | 39% | 97% | 99% | 57% | 87% | 93% |
| ICC | 0.019 | 0.001 | 0.0003 | 0.058 | 0.016 | 0.009 |
| MOR | 1.27 | 1.06 | 1.03 | 1.54 | 1.25 | 1.18 |
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.