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External Validity: In this study, we used 19 of 30 systems used by Couto et al. (2013).
Regarding the external validity in this study, which is concerned with the generalization of the results (Wohlin et al., 2000), we will discuss four issues.
One limitation and threat to the internal validity in this study could be the imputations made for attritions, which could lead to various forms of bias.
We argue that generalizability can be considered as a threat to validity in this study since we have used the Open Hub data repository as the main source for collecting data.
This new measurement tool to assess methodological quality of systematic reviews showed satisfactory inter-observer agreement, reliability and construct validity in this study.
The GSRS demonstrates adequate construct validity in this study.
Similar(36)
The NNIPPS diagnostic criteria represent a simplification of existing diagnostic criteria and we have shown them to have excellent convergent and predictive validities in this study population, despite variations in practice across three European countries and 44 centres.
The self-reported musculoskeletal functional limitations index appears to be a valid measure of musculoskeletal functional limitations, in the aspects of validity assessed in this study.
However, the low validity found in this study cannot be directly attributed to recall bias.
In Cambodia the measure of symptom control did not meet the criteria for validity used in this study.
The methodology used for constructing the NZDQI-A may have implications for validity estimates in this study.
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