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Table 1 Number of reviews by type of intervention

From: Room for improvement? A survey of the methods used in systematic reviews of adverse effects

Year of publication Type of intervention Total number of reviews
  Drug Surgical/dental Physical Diagnostic/screening Other  
1994 5 0 0 0 0 5
1995 9 0 0 0 3 12
1996 9 6 2 0 5 21
1997 15 2 1 0 6 29
1998 18 2 0 0 4 23
1999 21 1 0 1 4 27
2000 13 2 1 0 2 17
2001 17 1 2 0 9 27
2002 19 7 3 0 11 40
2003 26 1 3 0 14 44
2004 12 1 1 0 3 17
Jan-Apr 2005 0 0 0 0 0 0
Total 164 20 13 1 56 256
  1. The sum of reviews by intervention is greater than the total number of reviews because 5 reviews examined 2 (4 reviews) or 3 (1 review) types of intervention (e.g. drug and non-drug antihypertensive therapy)