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. 2009 Jan;30(1):165–170. doi: 10.3174/ajnr.A1276

Table 3:

Hemorrhage rates versus pial collateral formation and platelet level*

Parameter Rate of Any Hemorrhage P Value (Pearson) Rate of Significant Hemorrhage P Value (Pearson)
Total 26/104 (25.0%) 10/104 (9.61%)
Good collaterals 13/72 (18.1%) .0142 2/72 (2.78%) .0004
Poor collaterals 13/32 (40.6%) 8/32 (25.0%)
Platelets <200K 16/42 (38.1%) .0111 8/42 (19.0%) .0072
Platelets >200K 10/62 (16.1%) 2/62 (3.23 %)
*

Shows significantly higher rates of any hemorrhage and significant hemorrhage (volume > 25 mL) among patients with poor pial collaterals and platelet levels <200,000/μL.