Table 5.
Study duration means of trials included for analysis grouped by data collection frequency, masking, and study sponsorship.
| Variable | n (%) | Mean duration (months) | SD | 95% CI | ||
| Low | High | |||||
| Data collection points | 61 (100) |
|
|
|
|
|
|
|
One | 12 (19.7) | 25 | 11 | 18.0 | 32.2 |
|
|
Two | 18 (29.5) | 16 | 11 | 10.2 | 21.2 |
|
|
Three | 13 (21.3) | 18 | 8 | 12.9 | 22.0 |
|
|
Four or more | 11 (18.0) | 30 | 17 | 18.5 | 41.9 |
|
|
Continuous | 7 (11.5) | 20 | 12 | 8.3 | 30.9 |
| Masking | 61 (100) |
|
|
|
|
|
|
|
Open | 46 (75.4) | 19 | 11 | 15.2 | 21.8 |
|
|
Single-blind | 13 (21.3) | 29 | 16 | 19.1 | 38.8 |
|
|
Double-blind | 2 (3.3) | 16 | 7 | -47.5 | 79.5 |
| Study sponsorship | 64 (100) |
|
|
|
|
|
|
|
Academic | 49 (76.6) | 23 | 13 | 19.0 | 26.7 |
|
|
Industry | 5 (7.8) | 10 | 2 | 7.5 | 13.3 |
|
|
Academic-industry collaboration | 10 (15.6) | 15 | 6 | 10.4 | 19.4 |