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Table 2 Study characteristics of included ITS

From: Methodology and reporting characteristics of studies using interrupted time series design in healthcare

  N = 116
Study definition provided in at least title, abstract or main paper 74 (64)
 Title, abstract, and main paper 9 (12)
 Abstract and main paper 16 (22)
 Title and main paper 17 (23)
 Title and abstract 1 (1)
 Title 5 (7)
 Abstract 7 (9)
 Main paper 19 (26)
Country of study
 USA 39 (34)
 UK 18 (16)
 Asia 18 (16)
 Europe 14 (12)
 Canada 11 (9)
 Australia 7 (6)
 Africa 6 (5)
 Middle East 2 (2)
 Panama 1 (1)
Type of intervention
 Programs (e.g. multifaceted) 41 (35)
 Policy (e.g. regulatory) 32 (28)
 Health systems 25 (22)
 Guidelines 19 (16)
 Financial 19 (16)
 Behavioural 15 (13)
 Sales and dispensing 1 (1)
Level of intervention
 Hospital 73 (63)
 Hospital department 22 (19)
 Individual 17 (15)
 GP practices 3 (3)
 Pharmacy 1 (1)
Participants
 Health professional 92 (79)
 Disease 30 (26)
 Occupational 3 (3)
 Population 1 (1)
Data source
 Hospital data 64 (55)
 Health records 27 (23)
 National data 26 (22)
 Insurance data 11 (9)
 Other 3 (3)
Type of outcome
 Continuous 66 (57)
 Rate 38 (33)
 Binary 11 (9)
 Count 1 (1)
Frequency
 Monthly 74 (64)
 Quarterly 23 (20)
 Yearly 14 (12)
 Weekly 2 (2)
 Othera 3 (3)
Number of data points - median (25th,75th centile)
 Pre-intervention 18 (12–32)
 Post-intervention 19 (12–34)
 Ratio of pre/ post-intervention data points 1 (1–2)
 Transition period (n = 20) 3 (1–9)
 Other data points that were accounted for (n = 3) 2 (2–8)
  1. Values are n (%) unless otherwise stated. a 90 day periods; five times over two weeks before and after; daily
  2. Abbreviations: US United States, UK United Kingdom
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