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Table 3 Number and average quality of pilot RCTs over time of publication

From: Pilot randomized controlled trials in the orthopaedic surgery literature: a systematic review

Year Number of Trials Mean Clear NPT Score
1996 1 18.0
1997 1 16.5
1998 1 16.5
2001 1 16.5
2002 1 17.0
2003 3 16.5
2005 1 11.0
2006 1 16.0
2007 1 15.5
2008 3 17.5
2009 5 14.9
2010 2 17.0
2011 5 15.0
2012 4 15.9
2013 10 15.3
2014 6 15.7
2015 3 16.3
2016 0 n/a
2017 0 n/a
2018 0 n/a