Ovarian cancer was also positively associated with the very high exposure category [2.1 (95% CI: 0.8, 5.5) n = 5] but again imprecise because of small numbers, and weaker associations for the high and medium exposure categories with a negative association in the lowest exposure category.
The finding of a higher prevalence of 'any eye symptom' in the medium exposure zone compared with the low exposure zone is difficult to interpret.
10 Sandmark et al 11 showed OR 2.1 and 1.4, respectively, among workers with high and medium exposure to kneeling work demands compared with low or no exposure.
Recent reports show that occupational silica exposure moderately increases the risk of Scl, with medium exposure increasing the risk twofold and high exposure increasing the risk fourfold [ 85].
IgA appears to be higher in children with the medium exposure level (dynamic cohort 1993 1998) compared to children with lower and higher exposures (convex curve).
In the adjusted analysis, the associations were strengthened with the medium exposure category estimate for FEV1 becoming statistically significant, and the dose response trend significant for FEV1 and near-significant for FVC (table 2).
Contraceptive prevalence increased positively and linearly with greater exposure (medium exposure, 34.6%; high exposure, 43.4%).
The experience of recent symptoms increased with exposure; cough (medium exposure OR 3.6; 95% CI 1.6 to 8.1; high exposure OR 4.5; 95% CI 2.0 to 10.2), phlegm (medium exposure OR 4.2; 95% CI 1.5 to 11.8, high exposure OR 6.0; 95% CI 2.1 to 17.1) and insomnia (medium exposure OR 2.4; 95% CI 1.2 to 5.0, high exposure OR 2.8; 95% CI 1.3 to 5.9; table 5).
Objective exposure was measured by the localisation of the service in geographical zones with low exposure to immigration, medium exposure, or high exposure.
The independent variable was exposure to wildfires in August 2006, with municipalities thus being classified into the following three categories: no exposure; medium exposure; and high exposure.
