Table 1.

Descriptive statistics relevant to missingness among studies assessed

CharacteristicNumber of articles%
Included in assessment among all CEBP Research Articles, Short Communications, and Null Results in Brief from January 1, 2009 to March 31, 2010 (N = 534)27852
Had missing data among articles included (N = 278)18466
Used data availability as inclusion criterion among articles included (N = 278)12645
Either had missing data or used availability of data as part of inclusion criteria among assessed (N = 278)26595
Acknowledged presence of missing data among those with missing data (N = 184)15785
Used CC analysis among those with missing data (N = 184)16188
Used missing data methods among those with missing data (N = 184)2313
Used single imputation to address limits of detection among those who used a method (N = 23)939
Described differences between those included in and excluded from analysis among those with missing data (N = 184)2614
Described differences between those included in and excluded from analysis among those with either missing data or that used data availability as inclusion criterion (N = 265)2710