Operator and site factors versus the occurrence of an ischemic event (n=21)
| All ischemic stroke or CITS | ||||||
|---|---|---|---|---|---|---|
| Factor | No of sites or operators | No of patients | Perforator stroke or CITS (n (%)) | n (%) | p Value | Difference (95% CI)† |
| SAMMPRIS site enrollment | ||||||
| High (≥12) | 12 | 111 | 10 (9.0) | 14 (12.6) | 0.18 | 5.7% (−2.7% to 14.3%) |
| Low (<12) | 36 | 102 | 5 (4.9) | 7 (6.9) | ||
| High enrolling registry site | ||||||
| No | 38 | 132 | 7 (5.3) | 11 (8.3) | 0.35 | −4.0% (−13.8% to 4.3%) |
| Yes | 10 | 81 | 8 (9.9) | 10 (12.3) | ||
| Primary specialty of interventionist | ||||||
| Radiology | 39 | 115 | 9 (7.8) | 10 (8.7) | 0.76 | 1: −2.4% (−15.6% to 8.4%) |
| Neurosurgery | 18 | 72 | 4 (5.6) | 8 (11.1) | 2: −2.8% (−27.9% to 10.3%) | |
| Neurology | 6 | 26 | 2 (7.7) | 3 (11.5) | 3: −0.4% (−25.1% to 15.5%) | |
| Credentialing: No of study devices | ||||||
| <10 | 30 | 71 | 3 (4.2) | 3 (4.2) | 0.054 | −8.5% (−15.94% to 1.1%) |
| ≥10 | 33 | 142 | 12 (8.5) | 18 (12.7) | ||
| Credentialing: No of aneurysm stents | ||||||
| <6 | 29 | 116 | 11 (9.5) | 14 (12.1) | 0.26 | 4.9% (−3.9% to 13.2%) |
| ≥6 | 34 | 97 | 4 (4.1) | 7 (7.2) | ||
| No of years in practice | ||||||
| <8 | 28 | 104 | 6 (5.8) | 10 (9.6) | 0.99 | −0.5% (−8.9% to 8.1%) |
| ≥8 | 35 | 109 | 9 (8.3) | 11 (10.1) | ||
| No of SAMMPRIS PTAS cases | ||||||
| <3 | 31 | 43 | 2 (4.7) | 3 (7.0) | 0.58 | −3.6% (−11.5% to 9.6%) |
| ≥3 | 32 | 170 | 13 (7.6) | 18 (10.6) | ||
*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).
‡Total in both groups exceeds 63 interventionists because individual interventionists had patients in both groups.
CITS, cerebral infarct with temporary signs; PTAS, percutaneous transluminal angioplasty and stenting.