Occupational Exposure of Pregnant Women to Refined Oil Causes Asthma in the Children Within 12 Months of Age: Analysis of Data from the Japan Environment and Children's Study

Pregnant women with monthly or weekly exposure to RO continued cigarette smoking after pregnancy, consumed less alcohol, had lower annual income, lived in wooden houses, and used kerosene or charcoal heaters. The proportion of pregnant women with a clinical history of allergies (asthma, atopic dermatitis, allergic rhinitis, allergic conjunctivitis, and food allergy) was comparable among the three exposure groups. Women with limited RO exposure did not smoke after delivery. Most pregnant women exposed to RO occupationally were professional and engineering workers (1182 women), clerical workers (832), and service workers (1014).

                  Before performing the statistical analyses, we confirmed that Spearman's rank correlation of all variables and covariates was below 0.3.