Measuring adherence in clinic-based physiotherapy 23 However, the RAdMAT-NL is a new measurement, so the reliability of the RAdMATNL is unknown. When a measurement is adjusted (translated) or is used for another population (have become a new measurement), it is important to reassess the validity and reliability of the measurement. Reliability is the consistency or repeatability of the measures [14]. There are two aspects of reliability. First the intra-rater reliability: the degree of agreement among repeated administrations of a diagnostic test performed by a single rater. Second is the inter-rater reliability: the degree of agreement among raters [14]. The RAdMAT-NL has to be reliable and valid to ensure that the evaluation is consistent and accurate [14]. If the RAdMAT-NL shows psychometric properties similar to or higher than the original measurement, it may be considered as culturally acceptable [16]. Evaluating the reliability of the RAdMAT-NL would be a first step in the development of a Dutch instrument for measuring adherence in the physiotherapy practice. Therefore, the purpose of this study was to measure the inter-rater reliability of the Dutch version of the RAdMAT (RAdMAT-NL) in patients who are undertaking physiotherapeutic rehabilitation (patients with musculoskeletal complaints and with chronic diseases). Materials and Methods Study design This was a cross sectional study conducted between November 1 and December 1, 2017. Setting A primary physiotherapy practice in the Netherlands was chosen because the original version of the RAdMAT was validated for use in a primary practice setting, and because this practice has a diverse patient population, including patients with musculoskeletal complaints and with chronic diseases, like diabetes, chronic obstructive pulmonary disease (COPD) and multiple sclerosis (MS). The presence of patients with chronic diseases is important, because this study had to evaluate the use of the RAdMAT-NL in this population. Participants Participants were patients undertaking physiotherapeutic rehabilitation in the primary physiotherapy practice who met the inclusion and exclusion criteria. The inclusion criteria were: being at least 18 years old, undertaking rehabilitation at the practice (rather than at home), and having a musculoskeletal injury or a chronic disease. The exclusion criteria were undertaking manual therapy or orofacial
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