Validation of a Population Screening Questionnaire to Assess Prevalence of Stroke

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Abstract
Background and Purpose A cross-sectional survey is the best method for determining the prevalence of a chronic condition such as stroke. Before embarking on a large population study, a valid screening instrument is necessary. This study aimed to validate a self-completion postal screening questionnaire for assessing lifetime history of stroke. Methods A random sample of 2000 people aged 45 years and over was selected from the Family Health Services Authority register. A brief self-completion questionnaire requesting self-reported history of stroke was mailed to each individual. Responders reporting a history of stroke received a request for a standardized home assessment visit. Confirmation of the diagnosis of stroke was made based on information from the home visit together with multiple sources of case ascertainment. False-negative responses and assessment of nonresponse bias were documented. Results The response rate for the questionnaire was 88%. Of the sample, 120 (6%) who were wrongly registered wer...