Figure 1.
Study flow diagram.
Figure 2.
PRISMA flow diagram.
Table 1.
Study characteristics for inception cohorts.
Table 2.
Methodological Quality Assessment.
Figure 3.
Status of approved protocols for Chan 2004b study [17].
Figure 4.
Status of approved protocols for Easterbrook 1991 study [24].
Figure 5.
Status of approved protocols for Dickersin 1992 study [23].
Figure 6.
Status of approved protocols for Dickersin 1993 study [3].
Figure 7.
Status of approved protocols for Stern 1997 study [4].
Figure 8.
Status of approved protocols for Cooper 1997 study [19].
Figure 9.
Status of trials for Wormald 1997 study [30].
Figure 10.
Status of approved protocols for Ioannidis 1998 study [5].
Figure 11.
Status of approved protocols for Pich 2003 study [27].
Figure 12.
Status of approved protocols for Cronin 2004 study [20].
Figure 13.
Status of approved protocols for Decullier 2005 study [7].
Figure 14.
Status of approved protocols for Decullier 2006 study [22].
Figure 15.
Status of approved protocols for Hahn 2002 study [26].
Figure 16.
Status of approved protocols for Chan 2004a study [18].
Figure 17.
Status of approved protocols for Ghersi 2006 study [25].
Figure 18.
Status of approved protocols for von Elm 2008 study [29].
Figure 19.
Status of approved protocols for Turer 2007 study [28].
Figure 20.
Status of approved protocols for De Jong 2010 study [21].
Figure 21.
Status of approved protocols for Blumle 2008 study [31].
Figure 22.
Status of approved protocols for Hall 2007 study [32].
Table 3.
Publication and trial findings.
Table 4.
Aspects of study level publication bias.
Table 5.
Comparisons of primary outcome stated in protocol and in publication.