Table 2.
Relation between enrolment interval, journal types, and journal impact factors of trials registered retrospectively in ISRCTN registry
| Journal characteristics | No of trials registered retrospectively within enrolment interval/total No registered (%) | P value* |
|---|---|---|
| Overall | 234/330 (70.9) | |
| Journal type: | ||
| ICMJE member journal | 31/39 (79.5) | 0.14 |
| Follows ICMJE recommendations | 58/91 (63.7) | |
| Neither | 145/200 (72.5) | |
| Journal impact factors†: | ||
| Top quarter | 57/72 (79.2) | 0.04 |
| Third quarter | 53/71 (74.6) | |
| Second quarter | 54/77 (70.1) | |
| Bottom quarter | 38/66 (57.6) |
*
Pearson’s χ2 test.
†
Excluding 44 published trial papers as journal impact factor could not be identified.