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Table 4 Number of participating countries by starting year of trials

From: How Can the Evidence from Global Large-scale Clinical Trials for Cardiovascular Diseases be Improved?

Number of countries Number of trials (N = 333*)
  -2000 2001-2005 2006-2010 Total
Single country 19 73 135 227 (68.2%)
Multiple countries 16 40 50 106 (31.8%)
   2-5 countries 8 14 13 35 (10.5%)
   6-20 countries 7 10 20 37 (11.1%)
   > 20 countries 1 16 17 34 (10.2%)
  1. * 11 trials whose starting years or countries were unknown were excluded.