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 (%) | Â |
  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 (%) | Â |
  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 (%) | Â |
  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 (%) | Â |
  No | 1,057 (83.8) |
  Yes | 204 (16.2) |