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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)