Table 2

Comparison of electronic versus self-reported adherence by age group, sex, time in study and cognition
Electronic Adherence Self-Reported Adherence
Subgroup Possible Days Days Recorded* MeanSD) Days Reported MeanSD)
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)

*refers to the actual number of days recorded using the electronic monitor.

refers to actual number of days recorded as being adherent on the self-reported log book.

Jeffrey et al.

Jeffrey et al. BMC Medical Research Methodology 2012 12:171   doi:10.1186/1471-2288-12-171

Open Data