
Keywords: CI; confidence interval; COPD; chronic obstructive pulmonary disease; DBP; dibutyl phthalate; DEHP; di-(2-ethylhexyl) phthalate; FEF25-75; forced expiratory flow at 25-75% of the forced vital capacity; FEV1; forced expiratory volume in 1â¯s; FEV1/FVC