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Table 3 Non-compliance and missing data

From: Non-compliance with randomised allocation and missing outcome data in randomised controlled trials evaluating surgical interventions: a systematic review

Outcome Descriptive statistics n (%) unless otherwise stated N = 82
Non-compliance with allocated intervention
 Yes 45 (55)
 No 26 (32)
 Unclear 11 (13)
Percentage of non-compliance
 In all studies N; median 68a; 2
 [25th, 75th centiles] [0, 5]
 (Min, max) (0, 29)
 Only in studies with non-compliance N; median 42a; 4
 [25th, 75th centiles] [2, 7]
 (Min, max) (1, 29)
Missing data for primary outcome
 Yes 52 (63)
 No 23 (28)
 Unclear 7 (9)
Percentage of missing data
 In all studies N; median 74b; 6
 [25th, 75th centiles] [0, 15]
 (Min, max) (0, 57)
 Only in studies with missing data. N; median 52b; 12
 [25th, 75th centiles] [6, 19]
 (Min, max) (0, 57)
  1. a3 studies where non-compliance was reported but it was not possible to derive the percentage of participants and 11 studies where non-compliance was unclear
  2. b1 study where missing data were reported but it was not possible to derive the percentage of participants and 7 studies where missing data were unclear