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Table 2 General characteristics of included guidelines (N = 40)

From: Guidelines for randomized clinical trial protocol content: a systematic review

General characteristic n (%)
Type of document  
   Journal article 22 (55)
   Book 7 (16)
   Institutional or international agency guideline not presented in one of the above 10 (25)
   Other (1 website) 1 (3)
Date of publication/version  
   Earlier than 1971 1 (3)
   1971-1980 5 (13)
   1981-1990 7 (18)
   1991-2000 6 (15)
   2001-2010 18 (45)
   Not stated/unclear 3 (8)
Format  
   Text (for example, headings) 11 (28)
   Checklist/Table/Bullet list 16 (40)
   Checklist/Table/Bullet list and additional text 11 (28)
   Template 2 (5)
Scope  
   RCT only 7 (18)
   More than RCTs 29 (73)
   Unclear/not stated 4 (10)
Guidance version  
   New guidance 31 (78)
   Building on existing guidance 5 (13)
   Update of previous guidance 4 (10)
Funding  
   Yes - non-profit 6 (15)
   Not reported/Unclear 33 (83)
   Reported no funding 0 (0)
Endorsement (explicit or probable) 15 (38)
Number of items - median (IQR); range 23 (14, 34); 7 to 109
Number of explicit concepts addressed* - median (IQR); range 31 (24, 80); 16 to 150
  1. *from N = 23 guidelines with description of development methods, use of evidence to support recommendations, or institutional endorsement (explicit or probable).