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Table 2:

Pretest and posttest probabilities of DCI based on clinical classification schemesa

Clinical Classification SchemesPretest Probability (95% CI)Posttest Probability
CTP-Positive (95% CI)CTP-Negative (95% CI)
Hunt and Hess grades 1–2210.35 (0.25–0.45)0.62 (0.52–0.72)0.10 (0.04–0.16)
Hunt and Hess grades 3–5210.61 (0.53–0.70)0.82 (0.74–0.90)0.25 (0.16–0.34)
Glasgow Coma Scale ≥9210.45 (0.38–0.53)0.72 (0.63–0.81)0.15 (0.08–0.22)
Glasgow Coma Scale <9210.71 (0.57–0.86)0.88 (0.82–0.95)0.35 (0.26–0.45)
Modified Fisher grade 1260.13 (0.0–0.29)0.31 (0.22–0.40)0.03 (0.0–0.06)
Modified Fisher grade 2, 3260.20 (0.11–0.28)0.44 (0.34–0.54)0.05 (0.01–0.09)
Modified Fisher grade 4260.36 (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.