The phrase "a useful and valid" is correct and usable in written English.
It can be used when describing something that is both practical and acceptable or legitimate in a particular context.
Example: "The research provided a useful and valid framework for understanding the issue at hand."
Alternatives: "a practical and legitimate" or "an effective and acceptable".
The ASUI represents a useful and valid measure of preference-weighted asthma symptoms for use in clinical trials and clinical management.
The FOS MSSI is an adaptation of the MSSI scoring system for use in FOS and has been shown to be a useful and valid tool to evaluate disease severity and progression in adult patients with FD [ 10, 11].
Quotations would need to be explicitly referenced so that the original author and publication should be given full credit for creating such a useful and valid description.
We concluded that the CPG is a useful and valid objective instrument for measuring change in severity of chronic pain over time and could be used in longitudinal studies of chronic pain severity.
CONCLUSIONS: The treadmill score is a useful and valid tool that can help clinicians determine prognosis and decide whether to refer outpatients with suspected coronary disease for cardiac catheterization.
We must start somewhere, and allowing a bioethicist, as an integrated member of the health care team, to address provider moral distress may be a useful and valid starting place.
Self-reported scores via an SRCQ is a potentially useful and valid method of assessing compliance of rhGH injections, as both reported and directly monitored methods yield similar changes in levels of IGF-I.
In order to define whether a model is useful and valid for clinical and trial simulations, thorough evaluation and validation of the model is necessary.
Our results suggest that welfare questionnaires is a useful, reliable, and valid tool for primate welfare assessment.
Asymptotic modal analysis (AMA) has been shown to be a useful approximation and valid limiting case for classical modal analysis (CMA) when the number of resonant modes in a frequency bandwidth becomes sufficiently large and the cross-correlation between resonant modes is neglected.
Overall, the results of this study showed that the LQPT is a useful, reliable and valid instrument.
