Table 1

Operator and site factors versus the occurrence of a hemorrhagic or ischemic event (n=34)

Hemorrhagic or ischemic event
FactorNo of sites or operatorsNo of patientsn (%)p Value*Difference (95% CI)†
SAMMPRIS site enrollment
 High (≥12)1211117 (15.3)0.85−1.4% (−11.7% to 8.7%)
 Low (<12)3610217 (16.7)
High enrolling registry site
 No3813221 (15.9)0.99−0.1% (−11.3% to 9.8%)
 Yes108113 (16.0)
Primary specialty of interventionist
 Radiology3911517 (14.8)0.281: 0.9% (−13.4% to 13.3%)
 Neurosurgery187210 (13.9)2: −12.1% (−38.7% to 7.3%)
 Neurology6267 (26.9)3: −13.0% (−39.5% to 7.9%)
Credentialing: No of study devices
 <1030717 (9.9)0.11−9.1% (−18.5% to 2.1%)
 ≥103314227 (19.0)
Credentialing: No of aneurysm stents
 <62911621 (18.1)0.454.7% (−5.8% to 14.7%)
 ≥6349713 (13.4)
No of years in practice
 <82810418 (17.3)0.712.6% (−7.5% to 12.9%)
 ≥83510916 (14.7)
No of SAMMPRIS PTAS cases
 <331437 (16.3)0.990.4% (−10.6% to 15.9%)
 ≥33217027 (15.9)
  • *p Value for Fisher's exact test comparing percentages among groups.

  • †Difference between percentages, calculated as first group − second group, except for primary specialty (1: radiology – neurosurgery; 2: radiology − neurology, 3: neurosurgery − neurology).

  • PTAS, percutaneous transluminal angioplasty and stenting.