Country of the first author | |
USA/Canada | 85 (37.8) |
United Kingdom | 53 (23.6) |
Other countries of the European Union | 69 (30.7) |
Other countries | 18 (8.0) |
Type of journal of publication | |
Cardiology | 66 (29.3) |
Other specialties | 43 (19.1) |
Medicine in general | 52 (23.1) |
Epidemiology/public health | 12 (5.3) |
Cochrane Library | 52 (23.1) |
Impact factor (Science Citation Reports) | |
<British Medical Journal | 171 (76.0) |
≥British Medical Journal | 54 (24.0) |
Epidemiologist among the authors | |
Yes | 83 (36.9) |
No | 142 (63.1) |
Statistician among the authors | |
Yes | 30 (13.3) |
No | 195 (86.7) |
Number of primary studies included in meta-analysis | |
0–5 | 61 (27.1) |
6–7 | 49 (21.8) |
8–10 | 42 (18.7) |
>10 | 73 (32.4) |