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Table 1 Characteristics of included studies by year of application/revision of the insurance service

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

Characteristics Number of articles (%)
Diseases  
  Lung cancer 30 (21.7)
  Lymphoma 5 (3.6)
  Head and neck cancer 12 (8.7)
  Colorectal cancer 8 (5.8)
  Breast cancer 10 (7.2)
  Esophageal cancer 4 (2.9)
  Stomach cancer 4 (2.9)
  Thyroid cancer 1 (0.7)
  Pancreatic cancer 6 (4.3)
  Cervical cancer 4 (2.9)
  Ovarian cancer 4 (2.9)
  Uterine cancer 6 (4.3)
  Prostate cancer 2 (1.4)
  Gastrointestinal stromal tumor 1 (0.7)
  Brain cancer 1 (0.7)
  Alzheimer’s disease 1 (0.7)
  Others 39 (28.2)
Modality  
  PET 94 (68.1)
  PET/CT 48 (34.8)
PET tracer  
  18 F-FDG 133 (96.4)
  Others 5 (3.6)
Publication year  
  2002 14 (10.1)
  2003 to 2006 38 (27.5)
  2007 to 2010 86 (62.3)
Sample size  
  Less than 24 30 (21.7)
  25 to 49 50 (36.2)
  50 to 99 31 (22.5)
  More than 100 27 (19.5)
Study type  
  Comparative study 68 (49.3)
  Non-comparative study 70 (50.7)
Study design  
  Prospective study 35 (25.4)
  Retrospective study 103 (74.6)
Funding source  
  Description included 17 (12.3)
  No description 121 (87.7)
Index type  
  Indexed in MEDLINE 69 (50.0)
  Not indexed in MEDLINE 69 (50.0)