From: Statistical analysis of publicly funded cluster randomised controlled trials: a review of the National Institute for Health Research Journals Library
Year of publication
Before
1997–2012
After
2013–2021
All
1997–2021
Number of trials
11
75
86
Number of primary outcomes
13
87
100
Number of primary outcomes with the observed ICC not reported (%)
4 (31)
38 (44)
42(42)