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Table 1 Basic characteristics of included systematic reviews on adverse events by drug or biologics

From: Effect of important modifiers on harmful effects in evidence synthesis practice of adverse events were insufficiently investigated: an empirical investigation

Basic characteristics

No. of systematic reviews (N = 279)

Region of the corresponding author

 Africa

14 (5.02%)

 America (North and South)

62 (22.22%)

 Asia

117 (41.94%)

 Europe

82 (29.39%)

 Oceania

4 (1.43%)

Type of meta-analysis

 Pairwise meta-analysis

241 (86.38%)

 Network meta-analysis

38 (13.62%)

The number of trials included

16 (IQR: 10 to 32)

 1 to 9 (minimum is 3)

69 (24.73%)

 10 to 29

135 (48.39%)

 30 or more (maximum is 597)

75 (26.88%)

Protocol

 Yes

77 (27.60%)

 No

202 (72.40%)

Topic of disease

 Cancer

113 (40.50%)

 Diabetes

29 (10.39%)

 Osteoarticular diseases

25 (8.96%)

 Cardiovascular diseases

16 (5.73%)

 Mental disorders

12 (4.30%)

 Inflammatory bowel disease

10 (3.58%)

 Respiratory diseases

9 (3.23%)

 Blood and lymphatic system diseases

8 (2.87%)

 Neuropathy diseases

7 (2.51%)

 Coagulation and anticoagulation

6 (2.15%)

 HCV/HIV/HPV

6 (2.15%)

 Autoimmune diseases

5 (1.79%)

 Infection

5 (1.79%)

 Neuropathy diseases

5 (1.79%)

 Addition

4 (1.43%)

 Lower urinary tract symptoms

3 (1.08%)

 Inflammation

3 (1.08%)

 Others

13 (4.66%)

Funding

 No funding

94 (33.69%)

 Not reported

85 (30.47%)

 Non-profit funding

94 (33.69%)

 For profit funding

6 (2.15%)

  1. HCV Hepatitis C virus, HIV human immunodeficiency virus, HPV human papillomavirus