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Table 1: 
CTP parameters in patients with good-versus-poor collateralsa
Perfusion ParameterAll PatientsPatients with Poor Collaterals (Score, 0–3)Patients with Good Collaterals (Score, 4–5)P Value
Tmax > 6 sec (mL)111 (102–119)135 (124–145)88 (77–99)<.001
Tmax > 8 sec (mL)74 (67– 82)97 (88–107)53 (44–63)<.001
Tmax > 10 sec (mL)48 (43–54)66 (58–74)32 (25–39)<.001
rCBF < 30%, mL24 (19–28)41 (33–49)8 (5–11)<.001
rCBF < 34%, mL30 (25–35)50 (41–58)11 (8–14)<.001
rCBF < 38%, mL36 (31–42)59 (50–68)15 (12–19)<.001
CBV-index0.68 (0.65–0.70)0.60 (0.56–0.63)0.76 (0.72–0.78)<.001
HIR0.37 (0.34–0.40)0.46 (0.42–0.50)0.29 (0.24–0.33)<.001
  • ↵a Data are given as mean values and 95% confidence intervals.