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Table 5 Reporting of control vs. experimental interventions

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

Number of components reported aControl interventions aExperimental interventions bControl arm per trial bExperimental arm per trial
n (%) n (%) n (%) n (%)
0 38 (36) 24 (20) 37 (36) 19 (18)
1 19 (18) 25 (21) 19 (18) 22 (21)
2 21 (20) 29 (24) 20 (19) 26 (25)
3 16 (15) 27 (23) 16 (16) 23 (22)
4 11 (10) 14 (12) 11 (11) 13 (13)
Total 105 (100) 119 (100) 103 (100) 103 (100)
  1. Table presents counts of the number of individual interventions (n = 224) and total number of included trials (N = 103) that reported between zero and all four components of test-treatment interventions. Items deemed not applicable were counted as reported
  2. aNumber of study arms reporting 0–4 components
  3. bNumber of trials reporting 0–4 components in at least one study arm (some trials evaluated multiple control and/or experimental groups)