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Table 1 General characteristics of therapeutic meta-analyses published in 2013 and including non-randomized studies of intervention (n = 188)

From: Meta-analyses including non-randomized studies of therapeutic interventions: a methodological review

Characteristic Included NRSI only Included NRSI&RCTs All meta-analyses
(n = 69) (n = 119) (n = 188)
No (%) No (%) No (%)
Journal type    
 Specialty 59 (86) 99 (83) 158 (84)
 General 10 (14) 20 (17) 30 (16)
Location of corresponding author    
 Asia 26 (38) 38 (32) 64 (34)
 Europe 22 (32) 39 (33) 61 (32)
 North-America 18 (26) 33 (28) 51 (27)
 Other 3 (4) 9 (7) 12 (7)
Medical area    
 Surgery 21 (30) 28 (24) 49 (26)
 Cardiology 8 (12) 25 (21) 33 (18)
 Oncology 6 (9) 19 (16) 25 (13)
 Other 34 (49) 47 (39) 81 (43)
Type of intervention    
 Pharmacological 36 (52) 56 (47) 92 (49)
 Non-pharmacological 32 (46) 60 (50) 92 (49)
   Surgical procedures 30 (43) 44 (37) 74 (39)
   Other 2 (3) 16 (13) 18 (10)
 Both pharmacological and non-pharmacological 1 (1) 3 (3) 4 (2)
Epidemiologists or statisticians involved 17 (25) 19 (16) 36 (19)
Declaration of conflict of interests 64 (93) 102 (86) 166 (88)
 Potential conflict of interests 9 (13) 17 (14) 26 (14)
Funding source    
 Public 30 (43) 36 (30) 66 (35)
 No specific funding 10 (14) 29 (24) 39 (21)
 Private 2 (3) 7 (6) 9 (5)
 Both public and private 3 (4) 2 (2) 5 (3)
 Not reported/unclear 24 (35) 45 (38) 69 (37)
Registration on PROSPERO 0 3 (3) 3 (2)
  1. NRSI non-randomized studies of intervention; RCTs randomized controlled trials