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Table 2 Factors related to methodological quality

From: An assessment of the characteristics and quality of diagnostic accuracy studies for positron emission tomography conducted in Japan: a systematic review

Variables Number of studies Odds ratio 95% confidence interval p value
Diseases     
  Respiratory cancer 30 Ref.   
  Gastrointestinal cancer 7 0.98 0.13 to 7.44 1.0
  Gynecological cancer 19 0.38 0.09 to 1.56 0.2
  Head and neck cancer 14 0.39 0.08 to 1.80 0.2
  Breast cancer 10 0.23 0.04 to 1.46 0.1
Others 58 0.23 0.07 to 0.76 0.02
Publication year     
  2002 14 Ref.   
  2003 to 2006 38 0.11 0.02 to 0.53 0.01
  2007 to 2010 86 0.30 0.07 to 1.30 0.1
Sample size     
  Less than 24 30 Ref.   
  25 to 49 50 1.43 0.47 to 4.35 0.5
  50 to 99 31 1.00 0.28 to 3.58 1.0
  Over 100 27 0.53 0.13 to 2.12 0.4
Study design     
  Retrospective study 103 Ref.   
  Prospective study 35 2.78 1.05 to 7.35 0.04
Funding source     
  No description 121 Ref.   
  Description included 17 2.9 0.78 to 10.73 0.1
Index type     
  Not indexed in MEDLINE 69 Ref.   
  Indexed in MEDLINE 69 0.84 0.34 to 2.10 0.7
Comparative study     
  No 72 Ref.   
  Yes 66 1.53 0.64 to 3.62 0.3