Type of documenta | All citations N = 4230 | Unique dissertations cited N = 1172 |
---|---|---|
Primary research work | 4,037 (95.4%) | 196 (17%) |
Evidence syntheses | 193 (4.6%) | 85 (7.2) |
 Policy relatedb | 22 (0.5%) | 16 (1.4%) |
 Systematic reviews | 130 (3.0%) | 67 (5.7) |
 Non-systematic reviews | 35 (0.8%) | 26 (2.2%) |
 Cost-effectiveness analyses | 7 (0.2%) | 5 (0.4%) |