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Table 1 Characteristics of systematic reviews ( N = 1,261) published in 2008 a

From: Bibliometrics of systematic reviews: analysis of citation rates and journal impact factors

Characteristics Data
Citations over a mean of four years, mean (±SD) 26.5 (28.9)
Two-year JIF, mean (±SD; n = 1,101) 4.3 (4.2)
Five-year JIF (mean ± SD; n = 1,016) 4.6 (4.1)
Number of authors, mean (±SD) 4.3 (2.7)
Number of pages, mean (±SD) 16.0 (25.6)
Country location of first author, n (%)  
  United Kingdom 301 (23.9)
  United States 285 (22.6)
  Canada 145 (11.5)
  The Netherlands 83 (6.6)
  Australia 83 (6.6)
  All other countries 364 (28.9)
ICD-10 chapters, n (%)  
  Neoplasms 135 (10.7)
  Diseases of the circulatory system 120 (9.5)
  Factors influencing health status and contact   with health services 119 (9.4)
  Mental and behavioural disorders 103 (8.2)
  Diseases of the digestive system 103 (8.2)
  All other ICD-10 codes 681 (54.0)
Intervention type, n (%)  
  Not an intervention 443 (35.1)
  Drugs and vaccines 243 (19.3)
  Surgery and dentistry 139 (11.0)
  Investigations, diagnostics or screening 128 (10.2)
  Health promotion 45 (3.6)
  All other interventions 263 (20.9)
International collaboration, n (%)  
  No 1,057 (83.8)
  Yes 204 (16.2)
  1. aICD-10, International Statistical Classification of Diseases and Related Health Problems, 10th Revision; JIF, journal impact factor.