TABLE 1—
Characteristics of Studies That Explored the Influence of Industry Sponsorship on Research Agendas: 1986–2017
| Characteristic | No. (%) |
| Total | 36 |
| Type of study | |
| Cross-sectional | 19 (52.8) |
| Content analysis | 7 (19.4) |
| Survey | 6 (16.7) |
| Qualitative | 3 (8.3) |
| Systematic review | 1 (2.8) |
| Level of evidencea | |
| 1 | 4 (11.1) |
| 2 | 1 (2.8) |
| 3 | 2 (5.6) |
| 4 | 29 (80.5) |
| 5 | 0 (0.0) |
| Industry type | |
| Medically related | 19 (52.8) |
| Tobacco | 4 (11.1) |
| Food | 3 (8.3) |
| Plant or animal biotechnology | 3 (8.3) |
| Chemical | 1 (2.8) |
| Alcohol | 1 (2.8) |
| Mining | 1 (2.8) |
| Not specified | 4 (11.1) |
| Funding source of the study | |
| Not for profit | 21 (58.3) |
| Mixed | 1 (2.8) |
| None | 4 (11.1) |
| No statement | 10 (27.8) |
a
1 indicates the highest level of evidence and 5 the lowest; assessed using “The Oxford 2011 Levels of Evidence” from the Oxford Centre for Evidence-Based Medicine.12