Data analyses
Data were analyzed using STATA version 13. Descriptive statistics were
provided using mean (± SD) or median (p25-p75) values depending on the
(non-) parametric distribution of measured variables. P-values ≤0.05
were considered statistically significant.
The association between the extent of HCPs’ usual care activities (sum
score of the Quality of Standard Care questionnaire) and the adherence
(MARS-5 total score) of patients was subjected to multilevel linear
regression analyses (see Huiskes et al.26). If a
healthcare practitioner did not answer one or more items of the usual
care questionnaire within the total of usual care activities or within a
sub scale, then the respondent was considered as lacking for the
calculation of the total sum score or the sum score of that sub scale.