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Table 3 Level of evidence

From: Chiropractic manipulation in pediatric health conditions – an updated systematic review

Level of evidence   # of studies
2004–2007
  # of studies
up to 2003
  total # studies
to June 2007
systematic reviews   1   1   2
RCT's   1   9   10
Observational   2   1   3
Descriptive   36   141   177
Conference abstracts   17   14   31
   RCT 0   5   5  
   OBSERV 1   0   1  
   DESC 16   9   25