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Table 2 Characteristics of included trials

From: Research waste in diagnostic trials: a methods review evaluating the reporting of test-treatment interventions

Trial characteristics Total (N = 103) 2004–5 (N = 56) 2006–7 (N = 47)
n (%) n (%) n (%)
Trial design:
 Parallel 90 (87) 49 (89) 41 (87)
 Factorial 3 (3) 2 (4) 1 (2)
 Cross-over 1 (1) 0 (−) 1 (2)
 Randomized disclosure 9 (9) 5 (7) 4 (9)
Randomization:
 Individual 97 (94) 53 (96) 44 (92)
 Cluster 6 (6) 2 (4) 4 (8)
Number of study arms:
 2 92 (89) 50 (91) 42 (88)
  > 2 11 (11) 5 (9) 6 (13)
Diagnostic comparison:
 Triage 17 (17) 9 (16) 8 (17)
 Additional 28 (27) 15 (27) 13 (27)
 Replacement 60 (58) 32 (57) 28 (58)
Medical Specialty:
 Cardiovascular Medicine 35 (34) 20 (36) 15 (31)
 Embryology 2 (2) 0 (−) 2 (4)
 Emergency Medicine 1 (1) 0 (−) 1 (2)
 Gastroenterology 14 (14) 6 (11) 8 (17)
 General Medicine 1 (1) 0 (−) 1 (2)
 Geriatrics 1 (1) 1 (2) 0 (−)
 Infectious diseases 1 (1) 1 (2) 0 (−)
 Neurology 3 (3) 1 (2) 2 (4)
 Obstetrics and Gynecology 17 (17) 6 (11) 11 (23)
 Oncology 5 (5) 5 (9) 0 (−)
 Ophthalmology 2 (2) 2 (4) 0 (−)
 Orthopedics 10 (10) 8 (15) 2 (4)
 Otolaryngology 1 (1) 1 (2) 0 (−)
 Psychiatry 2 (2) 0 (−) 2 (4)
 Respiratory 3 (3) 1 (2) 2 (4)
 Urology 2 (2) 1 (2) 1 (2)
 Multiple 3 (3) 3 (5) 0 (−)