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Table 3 Mean impact factor of articles published in journals included in the "Infectious Diseases" category of "Journal Citation Report" database and indexed by Pubmed, from different world regions, for the period 1995–2002.

From: Worldwide trends in quantity and quality of published articles in the field of infectious diseases

  Mean impact factor
WORLD AREAS 1995 1996 1997 1998 1999 2000 2001 2002 1995–2002(25th percentile, median, 75thpercentile)
USA 3.08 3.44 3.12 3.26 3.47 3.60 3.71 3.54 3.42 (2.29 3.51 4.21)
Canada 2.88 3.71 2.91 3.00 3.29 3.48 3.49 3.43 3.28 (2.08 3.20 4.18)
Oceania 2.69 3.17 3.01 2.84 2.75 3.53 3.28 2.99 3.05 (1.79 2.80 4.18)
Africa 2.83 2.87 3.12 2.46 3.00 2.87 3.01 2.90 2.89 (1.63 2.20 4.18)
Latin America and Caribbean 2.62 3.13 2.69 2.84 2.87 2.97 2.70 3.14 2.89 (1.77 2.63 4.04)
Western Europe 2.46 2.91 2.56 2.68 2.85 2.97 3.02 2.89 2.82 (1.41 2.36 3.93)
Japan 2.77 3.23 2.80 2.85 2.28 2.57 2.32 2.59 2.61 (1.35 2.52 4.03)
Asia (excluding Japan) 2.28 2.61 2.37 2.47 2.46 2.44 2.41 2.47 2.44 (1.34 2.01 3.24)
Eastern Europe 1.69 2.12 2.12 1.83 2.15 2.26 1.89 1.77 1.96 (1.20 1.58 2.29)
Mean (for all regions) 2.77 3.17 2.83 2.93 3.06 3.18 3.21 3.10