The goal of the PROM is to screen individual patients with mild disabilities who have been successfully treated for aSAH, since they are prone to undetected symptoms during their follow-up care. “Mild disabilities” was defined as an outcome on the modified Rankin Scale (mRS) of 0, 1, or 2. The mRS is a global disability scale that has an ordinal scale ranging from no residual symptoms (score of 0) to severely disabled (score of 5) [15]. The intention was to construct the PROM using (the domains of) existing PROMs and, if necessary, newly developed items.