Table 8. Associations between measured environmental factors and onset (incidence) of weekly symptoms during the two-year follow-up from 2010 to 2012 (N = 1283).
Type ofexposures | Any skinSymptoms(OR 95% CI) | Any mucosalSymptoms(OR 95% CI) | Any generalSymptoms(OR 95% CI) | Any symptomsimproved ifaway from school(OR 95% CI) | Any school relatedmucosal symptoms(OR 95% CI) | Any school relatedgeneral symptoms(OR 95% CI) |
Indoor climate and air pollutants in classrooms | ||||||
SO2 | 0.61(0.19–2.01) | 0.61(0.30–1.23) | 0.92(0.49–1.74) | 0.70(0.33–1.48) | 0.57(0.22–1.43) | 0.65(0.29–1.47) |
NO2 | 0.87(0.59–1.28) | 0.97(0.76–1.23) | 0.98(0.78–1.22) | 0.85(0.67–1.09) | 0.94(0.69–1.28) | 0.87(0.66–1.14) |
O3 | 0.86(0.59–1.26) | 0.91(0.74–1.12) | 0.91(0.75–1.10) | 0.88(0.70–1.11) | 0.93(0.72–1.21) | 0.92(0.73–1.17) |
PM10 | 1.39(1.10–1.76)** | 1.34(1.14–1.57)*** | 1.24(1.06–1.45)** | 1.01(0.84–1.22) | 1.33(1.09–1.63)** | 1.26(1.05–1.52)* |
Temperature | 1.49(0.28–7.80) | 1.45(0.51–4.08) | 1.12(0.82–1.23) | 1.21(0.95–1.35) | 1.17(0.98–1.33) | 1.24(0.91–1.40) |
CO2 | 1.43(0.96–2.11) | 1.59(1.23–2.06)*** | 1.85(1.45–2.36)*** | 1.73(1.31–2.27)*** | 1.93(1.43–2.62)*** | 1.87(1.41–2.48)*** |
RH | 1.33(0.93–1.76) | 1.47(1.22–1.76)*** | 1.51(1.27–1.79)*** | 1.41(1.16–1.71)*** | 1.65(1.33–2.05)*** | 1.56(1.28–1.91)*** |
Air pollutants outside the school | ||||||
SO2 | 2.08(1.11–3.90)* | 1.33(0.90–1.97) | 1.17(0.85–1.68) | 0.91(0.60–1.39) | 0.93(0.55–1.58) | 1.05(0.66–1.67) |
NO2 | 1.16(1.07–1.25)*** | 2.03(1.27–3.25)** | 1.64(1.06–2.54)* | 0.90(0.54–1.51) | 1.54(0.83–2.85) | 1.14(0.65–1.99) |
O3 | 0.60(0.34–1.08) | 1.11(0.75–1.65) | 1.14(0.79–1.64) | 1.47(0.94–2.29) | 1.24(0.72–2.13) | 1.51(0.92–2.48) |
PM10 | 1.22(1.07–1.40)** | 1.25(1.14–1.37)*** | 1.20(1.09–1.32)*** | 1.18(1.06–1.31)** | 1.33(1.20–1.47)*** | 1.29(1.17–1.43)*** |
Odds ratio (OR) with 95% confidence interval (CI) calculated by multiple logistic regression. Adjustment for age, gender and parental asthma or allergy, analysing each exposure variable separately.
*P<0.05.
**P<0.01.
***P<0.001.