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Table 3 Multivariable linear regression of sum of difficulties in clinical research
| All difficulties (15 items) | Scientific difficulties (7 items) | Logistical difficulties (7 items) | ||||
|---|---|---|---|---|---|---|
| Study characteristics: | Difference | 95 % CI | Difference | 95 % CI | Difference | 95 % CI |
| Public sponsorshipa (vs. private) | 1.3 | 0.4,2.1 | 0.9 | 0.4,1.3 | 0.4 | -0.1,0.9 |
| Single center study (vs. multicenter) | 0.8 | 0.1,1.5 | 0.6 | 0.2,1.0 | 0.3 | -0.1,0.7 |
| “Clinical” studyb (vs. otherc) | 0.7 | 0.0,1.3 | 0.1 | -0.2,0.5 | 0.6 | 0.3,1.0 |
