Univariate analysis of the association between the use of a humidifier disinfectant and the risk of children’s interstitial lung diseases in 1∶3 matched case and control.

aVariables in the previous 1 year. bUnivariate analysis; conditional logistic regression analysis. cImmune-suppressive therapy, general anaesthesia, transfusion, admission within 6 months, and prior use of antibiotics within 1 month. dThe occurrence of any of the following in the previous 6 months: autoimmune disease, chronic liver disease, chronic renal insufficiency, neurologic diseases with immobility, congenital heart disease, chronic lung disease, diabetes. eGarbage incinerator, sewage treatment plants, factory, chemical treatment area, plants, farm/orchard, cattle shed/pigsty, and power station.