Table 3. Publication and trial findings.
| Study ID | Total published (percentage) | Positive (percentage) | Negative (percentage) | Null (percentage) |
| Easterbrook, 1991 [26] | 138/285 (48%) | 93/154 (60%) | 12/34 (35%) | 33/97 (34%) |
| Dickersin, 1992 [27] | 390/514 (76%) | 260/314 (83%) | 130/200 (65%) | NI |
| Dickersin, 1993 [3] | 184/198 (93%) | 121/124 (98%) | 63/74 (85%) | NI |
| Stern, 1997 [4] | 189/321 (59%) | 153/232 (66%) | 13/37 (35%) | 23/52 (44%) |
| Cooper, 1997 [32] | 38/121 (status known for 117/121) (31%) | - | - | - |
| Wormald, [21] | 30/61 (status known for 39 completed trials) (49%) | 14/15 (93%) | 15/21 (71%) | NI |
| Ioannidis, 1998 [5] | 36/66 (55%) | 20/27 (74%) | 16/39 (41%) | NI |
| Pich, 2003 [28] | 26/123 (21%) | NI | NI | NI |
| Cronin, 2004 [31] | 28/70 (40%) | NI | NI | NI |
| Decullier, 2005 [29] | 205/649 (32%) (status known for 2481) | 129/188 (67%) | 3/16 (19%) | 14/44 (32%) |
| Decullier, 2006 [30] | 48/93 (status known for 47/51 completed trials) (52%) | 26/37 (70%) | 6/10 (60%) | NI |
| Hahn, 2002 [13] | 18/27 (67%) | NI | NI | NI |
| Chan, 2004a [14] | 48/105 (46%) | NI | NI | NI |
| Chan, 2004b [15] | 102/274 (37%) | NI | NI | NI |
| Ghersi, 2006 [17] | 103/226 (46%) | NI | NI | NI |
| Von Elm, 2008 [18] | 233/451 (52%) | NI | NI | NI |
1
Analysis restricted to 248completed, non confidential, with hypothesis tests and direction of results.
NI No information, this study does not look at this.
- Not able to work out values.
Status implies positive or negative findings.