External validation demonstrated the Ottawa SAH prediction models can identify pSAH using health administrative data

OBJECTIVES: The objective of the study is to externally validate three primary subarachnoid hemorrhage (pSAH) identification models. STUDY DESIGN AND SETTING: We evaluated three models that identify pSAH using recursive partitioning (A), logistic regression (B), and a prevalence-adjusted logistic regression(C), respectively. Blinded chart review and/or linkage to existing registries determined pSAH status. We included all patients aged ≥18 in …