Table 1.
Characteristics of 84 eligible Cochrane reviews and 524 trials examined
| Characteristic | Outcomes (N=855) |
Trials (N=524) |
Reviews (N=84) |
|||
|---|---|---|---|---|---|---|
| n | (%) | n | (%) | n | (%) | |
| Year of publication* | ||||||
| 1987 or earlier | 5 | (0) | 1 | (0) | 0 | (0) |
| 1988–1992 | 160 | (19) | 37 | (7) | 0 | (0) |
| 1993–1997 | 156 | (18) | 73 | (14) | 0 | (0) |
| 1998–2002 | 241 | (28) | 164 | (31) | 0 | (0) |
| 2003–2007 | 163 | (20) | 174 | (33) | 0 | (0) |
| 2008–2012 | 120 | (14) | 75 | (14) | 72 | (86) |
| 2013 | 10 | (0) | 0 | (0) | 12 | (14) |
|
| ||||||
| Type of intervention assessed+ | ||||||
| Clinical management | 238 | (28) | 202 | (39) | 39 | (46) |
| Biomedical prevention | 163 | (19) | 60 | (12) | 11 | (13) |
| Behavioral prevention | 467 | (55) | 170 | (32) | 17 | (20) |
| Health services | 256 | (30) | 92 | (18) | 17 | (20) |
*
For outcomes, the year of publication refers to the year in which the outcome was first named in a trial or review.
+
For outcomes, the total across the four types of interventions adds up to more than 855 because outcomes were often named across more than one type of interventions.