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Table 2 Comparison of electronic versus self-reported adherence by age group, sex, time in study and cognition

From: Self-reported adherence with the use of a device in a clinical trial as validated by electronic monitors: the VIBES study

  Electronic Adherence Self-Reported Adherence
Subgroup Possible Days Days Recorded* Mean (± SD) Days Reported Mean (± SD)
Overall   42,098 31,902 0.76 (± 0.23) 32,678 0.78 (± 0.23)
Age Group Age < 84 22,001 17,271 0.78 (±0.20) 17,496 0.79 (± 0.19)
  Age ≥ 84 20,097 14,631 0.74 (±0.26) 15,182 0.77 (± 0.26)
Gender Male 14,680 10,969 0.76 (±0.25) 11,247 0.78 (± 0.26)
  Female 27,418 20,933 0.76 (±0.22) 21,431 0.78 (± 0.21)
Time in Study 6 - <9 Months 6,830 5,378 0.79 (±0.22) 5,440 0.80 (± 0.22)
  9 - <12 Months 7,452 5,358 0.73 (±0.27) 5,622 0.76 (± 0.26)
  12 Months 27,816 21,166 0.76 (±0.22) 21,616 0.78 (± 0.22)
Short Blessed Test Score < 2 (Median) 17,889 14,001 0.78 (±0.20) 14,287 0.80 (± 0.19)
  ≥ 2 (Median) 24,209 17,901 0.75 (±0.25) 18,391 0.77 (± 0.25)
  1. *refers to the actual number of days recorded using the electronic monitor.
  2. refers to actual number of days recorded as being adherent on the self-reported log book.