Table 2 Classification of reasons for missing outcomes
From: Avoidable waste of research related to outcome planning and reporting in clinical trials
| Â | All trials published in 2010 or later | |||
|---|---|---|---|---|
Reasons for missing outcome | All trials (registered and unregistered) | Registered trials | ||
No. of affected outcomes (%) N = 971 | No. of affected trials (%)* N = 291 | No. of affected outcomes (%) N = 461 | No. of affected trials (%)* N = 156 | |
Inadequate planning | 282 (29) | 123 (42) | 282 (61) | 123 (79) |
Selective reporting | 36 (4) | 25 (9) | 34 (7) | 23 (15) |
Incomplete reporting | 204 (21) | 117 (40) | 98 (21) | 64 (41) |
Unable to distinguish between selective reporting and lack of planning | 363 (39) | 122 (42) | Â | Â |
Other situations | 86 (9) | 63 (24) | 47 (10) | 41 (26) |