1naresh
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Clinical Classification Schemes Pretest Probability (95% CI) Posttest Probability CTP-Positive (95% CI) CTP-Negative (95% CI) Hunt and Hess grades 1–221 0.35 (0.25–0.45) 0.62 (0.52–0.72) 0.10 (0.04–0.16) Hunt and Hess grades 3–521 0.61 (0.53–0.70) 0.82 (0.74–0.90) 0.25 (0.16–0.34) Glasgow Coma Scale ≥921 0.45 (0.38–0.53) 0.72 (0.63–0.81) 0.15 (0.08–0.22) Glasgow Coma Scale <921 0.71 (0.57–0.86) 0.88 (0.82–0.95) 0.35 (0.26–0.45) Modified Fisher grade 126 0.13 (0.0–0.29) 0.31 (0.22–0.40) 0.03 (0.0–0.06) Modified Fisher grade 2, 326 0.20 (0.11–0.28) 0.44 (0.34–0.54) 0.05 (0.01–0.09) Modified Fisher grade 426 0.36 (0.24–0.47) 0.66 (0.57–0.75) 0.11 (0.05–0.17)
↵a The pretest probabilities are based on literature review and the posttest probabilities are calculated from the CTP test characteristics derived from this study.