Table 2.
Conflict of interest, funding and impact factor by type of study
| Conflict of interest |
Funding |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type of study | N | None | Conflict | Unknown | Missing data | None | Unknown | Public +Private | Public only | Private only | Missing data | Average impact factor |
| Case study/case series | 38 | 44.7% | 21.1% | 28.9% | 5.3% | 23.7% | 55.3% | 0.0% | 7.9% | 7.9% | 5.3% | 2.6 |
| Cross sectional study | 111 | 42.3% | 26.1% | 28.8% | 2.7% | 12.6% | 21.6% | 9.0% | 34.2% | 18.9% | 2.7% | 2.3 |
| Ecological study | 7 | 42.9% | 42.9% | 14.3% | 0.0% | 14.3% | 0.0% | 14.3% | 28.6% | 42.9% | 0.0% | 6.3 |
| Cohort study | 57 | 22.8% | 68.4% | 8.8% | 0.0% | 1.8% | 8.8% | 8.8% | 28.1% | 52.6% | 0.0% | 4.9 |
| Case-control study | 2 | 0.0% | 100.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 50.0% | 50.0% | 0.0% | 4.1 |
| Non-controlled study | 18 | 22.2% | 44.4% | 33.3% | 0.0% | 0.0% | 0.0% | 27.8% | 33.3% | 38.9% | 0.0% | 2.7 |
| Comparative trial | 197 | 17.3% | 70.6% | 11.2% | 1.0% | 0.5% | 5.6% | 10.7% | 19.8% | 63.5% | 0.5% | 7.1 |
| Medico economic study | 32 | 28.1% | 53.1% | 15.6% | 3.1% | 3.1% | 15.6% | 9.4% | 28.1% | 40.6% | 3.1% | 5.7 |
| Qualitative study | 11 | 45.5% | 18.2% | 27.3% | 9.1% | 0.0% | 0.0% | 9.1% | 54.5% | 27.3% | 9.1% | 2.4 |
| Systematic review | 53 | 50.9% | 26.4% | 17.0% | 5.7% | 24.5% | 32.1% | 3.8% | 17.0% | 17.0% | 5.7% | 3.3 |
| Quantitative meta-analysis | 26 | 57.7% | 30.8% | 11.5% | 0.0% | 19.2% | 26.9% | 19.2% | 30.8% | 3.8% | 0.0% | 4.0 |
| Mathematical modeling | 9 | 44.4% | 44.4% | 11.1% | 0.0% | 0.0% | 0.0% | 55.6% | 22.2% | 22.2% | 0.0% | 5.3 |
| Unspecified method | 7 | 14.3% | 42.9% | 42.9% | 0.0% | 0.0% | 42.9% | 14.3% | 28.6% | 14.3% | 0.0% | 3.3 |