The aim of this study was to provide new evidence regarding the suitability of using self-reported QoL information in this impaired population by exploring the construct validity, reliability, and external validity of a MS-specific quality of life (QoL) instrument.
The suitability indices of construct validity in the impaired populations were populations were detailed in Table 1.
This technique could be of great value in patients with impaired left ventricular function, but the validity in these patients is not well established.
In summary, the suitability indices of external validity in the non-impaired populations were 83% (Table 1).
NI non-impaired, I impaired.
These differences in associations with risk factors support the validity of our definition of impaired median nerve conduction.
The higher prevalence of impaired verbal fluency, but not memory impairment, among those who were HIV seropositive [ 34] was consistent with previous research [ 35] and supports construct validity.
The Pain Scale devised by Fries et al 73 was validated against a standardized pain instrument, ie, the Visual Analog Scale, and has shown validity in detecting pain in intact to moderately cognitively impaired residents.
Another major subitem of validity is internal validity, which deals with the cause effect relationships, eg, the impaired nutritional status leads to poor outcome, and the nutritional support improves outcome, independent of the effect of the underlying disease.
However, given that many states have adopted a zero-tolerance policy toward drugged driving, the analysis using the cut-off point of > 0 ng/ml to define blood THC positivity provides the most relevant results for assessing the validity of using oral fluid test as a screening tool for detecting marijuana-impaired DUI.
