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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