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Of the 408 patients studied,373 had confirmed acute stroke and completed follow-up.The three stroke rating scales each predicted 3-month outcome with an accuracy of.79 or greater.The NIHSS provided the most prognostic information:sensitivity to poor outcome,.71(95%confidence interval[CI],.64 to.79);specificity,.90(95%CI,.86 to.94);and overall accuracy,.83(95%CI,.79 to.87).Logistic regression showed that the NIHSS added significantly to the predictive value of all other scores.No score added useful information to the NIHSS.A cut point of 13 on the NIHSS best predicted 3-month outcome.Baseline NIHSS best predicts 3-month outcome.The Canadian Neurological Scale and Middle Cerebral Artery Neurological Score also perform well.Baseline assessments in clinical trials only need to include a single stroke rating scale. |
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