PubMed Abstracts Identifying Group-Randomized Trials

PubMed Abstracts Identifying Group-Randomized Trials
  1995 2000 2005 2010 2015
Trial outcome reports 2 16 89 246 562
Secondary/follow-up 0 7 12 32 119
Study protocols 1 1 19 84 199
Methodology 3 11 22 19 44
Trial logistics 0 1 1 2 12
Other 3 10 20 70 171