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Table 2 Summary characteristics of included trials

From: A study of target effect sizes in randomised controlled trials published in the Health Technology Assessment journal

Characteristic N (% of total RTCs)
Volume
 20 (2016) 20 (18.7)
 19 (2015) 19 (17.8)
 18 (2014) 12 (11.2)
 17 (2013) 11 (10.3)
 16 (2012) 8 (7.5)
 15 (2011) 6 (5.6)
 14 (2010) 8 (7.5)
 13 (2009) 10 (9.3)
 12 (2008) 2 (1.9)
 11 (2007) 3 (2.8)
 10 (2006) 8 (7.5)
Clinical area
 Cardiovascular 11 (10.3)
 Critical Care 2 (1.9)
 Dermatology 9 (8.4)
 Diabetes 3 (2.8)
 Gastrointestinal 9 (8.4)
 Geriatrics 2 (1.9)
 Immunology 2 (1.9)
 Lifestyle 5 (4.7)
 Mental Health 18 (14.2%)
 Neurology 4 (3.7)
 Obstetrics and Gynaecology 2 (1.9)
 Oncology 4 (3.7)
 Orthopaedics 6 (5.6)
 Other 3 (2.8)
 Paediatrics 9 (8.4)
 Renal/Urology 6 (5.6)
 Respiratory 7 (6.5)
 Stroke 5 (4.7)
Reached statistical significance?
 Yes (p < 0.05) 35/107 (32.7%)
 No 72/107 (67.3%)
Final target sample size
 Mean 1122
 Median 432
Achieved sample size
 Mean 1015
 Median 404