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2.6 Confounding variables According to the relevant literature and previous research (17, 20, 40, 41), potential confounding variables included childs sex, childs age, parents age at the childbirth, maternal prepregnancy BMI, parents education level, household income, prenatal exposure to cooking oil fumes, mosquito coil smoke and incense burning smoke during pregnancy, childs ETS exposure during 03 years of age, childs nutritional status and physical activity frequency of 03 years old