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Table 1 Trial quality by decade of publication

From: Faecal blood loss with aspirin, nonsteroidal anti-inflammatory drugs and cyclo-oxygenase-2 selective inhibitors: systematic review of randomized trials using autologous chromium-labelled erythrocytes

Decade Quality score Total
  1 2 3 4 5  
1960s     2   2
1970s   5   3 1 9
1980s 1 11 5 7 2 26
1990s   5   3   8
2000s    1   1 2
Total 1 21 6 15 4 47