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Table 1 Characteristics of trials

From: A systematic review of cluster randomised trials in residential facilities for older people suggests how to improve quality

Characteristic Number of trials (%)
Publication year  
1992-2004 29 (40)
2005-2010 44 (60)
Country  
USA 17 (23)
UK 16 (22)
Netherlands 9 (12)
Canadaa 7 (10)
Australia 5 (7)
Sweden 5 (7)
Others 14 (19)
Number of clusters randomised  
  Median (IQR) 15 (10, 36)
  Range 3 to 230
Average cluster sizeb  
  Median (IQR) 26.2 (14.8, 42.9)
  Range 3.2 to 201.1
Primary focus of research (based on primary outcome)  
  Falls or fractures 21 (29)
  Medication use 13 (18)
  Quality of Life 13 (18)
  Use of restraints 6 (8)
  Respiratory 4 (6)
  Depression 2 (3)
  Other 14 (19)
  1. a of which two jointly with the USA.
  2. b Defined as number of individuals analysed/ number of clusters analysed, and which had 17 missing values, because we couldn’t obtain either the number of individuals or of clusters in the analysis.