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Table 1 Study characteristics

From: Levels of evidence: a comparison between top medical journals and general pediatric journals

Ā 

Number of studies (%)

Ā 

Number of studies (%)

Journal

Ā 

Number of Authors

Ā 

JAMA

24 (3.0)

<3

17 (2.1)

Lancet

27 (3.4)

3

89 (11.1)

NEJM

17 (2.1)

4

116 (14.4)

APAM

103 (12.8)

5

108 (13.4)

J. Peds

256 (31.8)

6

125 (15.5)

Peds

377 (46.9)

7

100 (12.4)

Ā Ā 

>7

249 (31.0)

Study type

Ā Ā Ā 

Therapeutic

331 (41.2)

Number of Centers**

Ā 

Prognostic

403 (50.1)

1

605 (75.4)

Diagnostic

58 (7.2)

2

37 (4.6)

Economic & Decision Analysis

12 (1.5)

3

23 (2.9)

Ā Ā 

4

15 (1.9)

Number of subjects*

Ā 

5

10 (1.2)

<10

31 (3.9)

>5

112 (14.0)

11-50

109 (13.6)

Ā Ā 

51-100

91 (11.3)

Sub-Specialty

Ā 

101-500

237 (29.6)

Adolescent Medicine

36 (4.5)

501-1,000

60 (7.5)

Pediatric Cardiology

47 (5.8)

1,001-5,000

131 (16.3)

Allergy & Immunology

39 (4.9)

5,001-10,000

38 (4.7)

Clinical Pharmacology

9 (1.1)

10,001-50,000

62 (7.7)

Pediatric Critical Care

17 (2.1)

50,001-100,000

9 (1.1)

Developmental Pediatrics

69 (8.6)

>100,000

34 (4.2)

Emergency Medicine

19 (2.4)

Ā Ā 

Endocrinology & Metabolism

50 (6.2)

Region

Ā 

Gastroenterology

28 (3.5)

North America

529 (65.8)

Hematology/Oncology

13 (1.6)

South America

7 (0.9)

Infectious Disease

67 (8.3)

Europe

174 (21.6)

Neonatal/Perinatal Medicine

68 (8.5)

Asia

29 (3.6)

Nephrology

13 (1.6)

Middle East

18 (2.2)

Neurology

35 (4.4)

India

2 (0.2)

Respirology

57 (7.1)

Africa

6 (0.7)

Rheumatology

8 (1.0)

Australia

39 (4.9)

Surgery

30 (3.7)

Ā Ā 

General Pediatrics

141 (17.5)

Ā Ā 

Other

58 (7.2)

  1. *Number of subjects not reported in 2 studies, **Number of centers not reported in 2 studies.
  2. JAMA ā€“ Journal of the American Medical Association, NEJM ā€“ New England Journal of Medicine, APAM ā€“ Archives of Pediatrics and Adolescent Medicine, J. Peds ā€“ Journal of Pediatrics, Peds ā€“ Pediatrics.