Acta neurologica Scandinavica
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The purpose was to compare the completeness of case ascertainment in two stroke registers, one local population-based, the other a national quality register (Riks-Stroke), and to examine if patient characteristics could be affected by selection bias. ⋯ Because of selection bias, outcome data get skewed when case ascertainment does not embrace all stroke cases. A community-based stroke register is the golden standard when measuring stroke incidence.