Search strategy 
Table 1 below represents the basic search string developed for this SR. The full list of search strings that were used to inspect and search each of the databases mentioned above is available in Supplementary Material; Table S1. The search strings were developed through several discussions among all the authors and were pretested several times in the different databases in order to make sure valid and reliable outcomes were obtained.
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Eligibility criteria 
The focus of the SR was to analyse the literature reporting on the effect of factors in adherence to treatment. The initial review included both experimental and non-experimental studies, and the results of both searches were analysed independently. The SR reported here focused only on the experimental studies, excluding the non-experimental ones that will be analysed and reported in a separate article. Studies published within the last ten years (2011-2022) were considered. All eligible studies had to be written in English. The population of interest in the studies under review was restricted to adult human patients who had been or were planning to be under treatment for a certain chronic or acute physical condition. Consequently, treatment was defined as not only medication taking, but also engaging in other health behaviours, such as attending follow-up appointments, implementing lifestyle changes (e.g., avoiding certain foods, engaging in specific exercise), and using medical devices. Finally, eligible publications had to report the effect of one or more factors on treatment adherence to be included in this review. The inclusion and exclusion criteria for the studies eligible for this review are summarized in Table 2.
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Selection of studies for inclusion