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Table 5 Comparison of the 50 most-cited versus 50 least-cited reviews a

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

Characteristics Top 50 cited Bottom 50 cited P-value of difference
Number of citations (mean) 132.0 (SD ±29.7) 0.6 (SD ±0.5) <0.000
JIF (mean) 10.5 (SD ±8.89) 2.3 (SD ±2.3) <0.000
Number of authors (mean) 6.3 (SD ±6.4) 3.5 (SD ±2.2) 0.004
Number of pages (mean) 12.5 (SD ±9.4) 13.7 (SD ±27.9) 0.790
International collaboration 24% 8% 0.029
Published in journals with JIF 100% 50% <0.000
Indexed in MEDLINE 100% 54% <0.000
Top ICD-10 chapter 16% ‘Neoplasms’ 20% ‘Diseases of the respiratory system’  
Top intervention type 40% ‘Not an intervention’ 28% ‘Not an intervention’  
Top country location of first author 48% United States 34% United Kingdom  
  1. aICD-10, International Statistical Classification of Diseases and Related Health Problems, 10th Revision; JIF, journal impact factor.