Sentence examples for confounders were obtained from inspiring English sources

Data on the vascular risk factors and confounders were obtained from a self-administered questionnaire.

Information regarding parental smoking, the child's respiratory symptoms and health care use and potential confounders were obtained by postal questionnaires.

Data used to assess outcomes and potential confounders were obtained from routinely recorded discharge diagnoses and causes of death.

Data on exposures and potential confounders were obtained from ALSPAC questionnaires administered during pregnancy and early infancy.

Data on exercise during pregnancy and potential confounders were obtained through computer-assisted telephone interviews either during pregnancy or after an early miscarriage.

Data on confounders were obtained from the questionnaire that was administered at 1 year, except tobacco smoke exposure which was obtained from the questionnaire at 8 years.

Information about several confounders was obtained from administrative databases.

Information about possible confounders was obtained from the questionnaires.

Information on potential confounders was obtained from questionnaire responses that were updated every 2 years.

Information on potential confounders was obtained from publicly available NHANES data.

Information on occupational exposure to wood dust and to potential confounders was obtained from telephone interviews and from registry data.