| Number of studies | Stroke or death % (95% CI) | |
|---|---|---|
| Prospective studies | 18 | 4.5% (4.2-4.9%) |
| Retrospective studies | 52 | 4.9% (4.6-5.3%) |
| RCTs | 8 | 7.0% (6.2-7.9%) |
| Not RCTs | 62 | 4.4% (4.2-4.7%) |
| Population-based | 8 | 6.2% (5.5-6.9%) |
| Not population-based | 54 | 4.4% (4.2-4.7%) |
| Single surgeon author | 6 | 2.3% (1.7-3.1%) |
| Surgeon only author | 35 | 4.1% (3.8-4.4%) |
| Non-surgeon author | 29 | 6.3% (5.7-6.7%) |
| Ascertainment independent | 20 | 6.7% (6.1-7.2%) |
| Ascertainment not independent or
unclear (all studies) | 50 | 4.0% (3.7-4.2%) |
| Published 1990 or earlier | 44 | 4.1% (3.8-4.4%) |
| Published 1991 or later | 26 | 6.0% (5.5-6.4%) |
| Poor quality | 21 | 2.9% (2.6-3.2%) |
| Fair quality | 14 | 5.1% (4.6-5.7%) |
| Good quality | 12 | 6.7% (6.2-7.4%) |
| Selection biased or unclear | 9 | 3.2% (2.8-3.6%) |
| Selection not biased | 38 | 5.2% (4.9-5.6%) |
| Population inadequately described | 12 | 3.4% (2.7-4.3%) |
| Population adequately described | 35 | 4.6% (4.4-4.9%) |
| Followup incomplete or unclear | 0 | No data |
| Followup complete | 47 | 4.5% (4.3-4.8%) |
| Complications not defined | 30 | 3.5% (3.3-3.8%) |
| Complications defined | 17 | 6.7% (6.2-7.3%) |
| Techniques not described | 32 | 3.4% (3.1-3.8%) |
| Techniques described | 15 | 6.1% (5.7-6.6%) |
| Ascertainment not independent | 27 | 3.4% (3.1-3.7%) |
| Ascertainment
independent (abstracted studies only) | 20 | 6.6% (6.1-7.2%) |
| Statistical analysis inadequate | 35 | 3.9% (3.6-4.2%) |
| Statistical analysis adequate | 12 | 6.0% (5.5-6.6%) |
| Duration of followup unclear or inadequate | 20 | 3.4% (3.1-3.8%) |
| Duration of followup adequate | 27 | 5.5% (5.1-5.9%) |
From: 4, Results - Carotid Imaging
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