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Table 1 Characteristics of included matching quality studies

From: The matching quality of experimental and control interventions in blinded pharmacological randomised clinical trials: a methodological systematic review

Characteristics n = 36 (%)
Specialty  
 Psychiatry 6 (17)
 Cardiology 5 (14)
 Respiratory medicine 5 (14)
 Infectious diseases 5 (14)
 Neurology 2 (6)
 Rheumatology 2 (6)
 Dermatology 2 (6)
 Complementary-alternative medicine 2 (6)
 Gastroenterology 1 (3)
 Medicala 3 (8)
 No information 3 (8)
Formulation types  
 Tablet 17 (47)
 Capsule 12 (33)
 Liquid (injection and oral medicament) 2 (6)
 Ointment 2 (6)
 Aerosol 2 (6)
 Nasal spray 1 (3)
Type of control intervention  
 Placebo 33 (92)
 Active 3 (8)
Producer of the interventions  
 Pharmaceutical company 25 (69)
 Investigators 1 (3)
 Not reported 9 (25)
 Pharmacy 1 (3)
Method of comparison  
 Group of assessors  
  Assessors n = 4 26 (72)
  Assessors n = 32-52 8 (22)
 Pilot trial 2 (6)
  1. aSpecific medical sub-specialties unclear