While the primary contrast using a single reference group did not reach statistical significance (OR 1.6, 95% CI 0.92–3.0; Supplementary Table S2 ), the sensitivity contrast comparing this configuration against all other configurations combined was statistically significant (OR 1.46, 95% CI 1.03–2.0; Supplementary Table S2 ).
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Interaction between vertebral artery hypoplasia and circle of Willis variants in posterior circulation stroke and TIA.
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