Table 1 Main features of the 58 eligible articles with a continuous risk factor.
Characteristic/Feature | Number of Articles n = 58 |
|---|---|
Journal (number of articles reviewed a ) | Â |
American Journal of Epidemiology (48) | 31 (53%) |
Annals of Epidemiology (23) | 9 (16%) |
Epidemiology (16) | 6 (10%) |
Journal of the American Medical Association (26) | 4 (7%) |
New England Journal of Medicine (32) | 3 (5%) |
Annals of Internal Medicine (11) | 2 (3%) |
British Medical Journal (24) | 1 (2%) |
International Journal of Epidemiology (16) | 1 (2%) |
Lancet (49) | 1 (2%) |
Journal of Clinical Epidemiology (9) | 0 |
Number of participants | Â |
< 1,000 | 10 (17%) |
1,000-5,000 | 23 (40%) |
5,000-20,000 | 8 (14%) |
20,000-100,000 | 11 (19%) |
> 100,000 | 6 (10%) |
Study Design | Â |
Cohort | 31 (53%) |
Cross-sectional | 17 (29%) |
Case-control | 10 (17%) |
Type of outcome | Â |
Binary | 27 (47%) |
Time to event | 18 (31%) |
Continuous | 9 (16%) |
Ordered categorical | 2 (3%) |
Unordered categorical | 2 (3%) |
Type of analysis for continuous exposure variable | Â |
Categorically only | 29 (50%) |
Both continuously and categorically | 21 (36%) |
Continuously only | 8 (14%) |