Figure 1.
Flowcharts for the old 2009 study and for the new 2013 study.
Table 1.
General descriptive information from the two samples of clinical trials registered in 2008/2009 and in 2012.
Table 2.
The presence of contact details in registered records in 2008/2009 and 2012.
Table 3.
The presence of contact details according to recruitment status for trials registered in 2012.
Table 4.
The completeness of intervention specifics in registered records in 2008/2009 and 2012.
Table 5.
Degree of specificity of primary outcomes in 2008/2009 and 2012.
Table 6.
The quality of information on contact details, interventions and primary outcomes per registry for trials registered in 2012.
Table 7.
Data recording formats for the three primary outcomes of this study (contact information, intervention specifics and outcome quality) at the registries that provided data to the ICTRP at the time of the study in 2013.