We are, instead, the servants of debt, of global forces we barely comprehend, let alone master, of dimly known internal desires and frailties, of bodily weaknesses and communal guilt, of location and environment.
The internal validity of the frailty indicators was tested with latent class analysis, by modelling an underlying variable with three ordered categories.
27 28 An internal validation of the frailty phenotype using latent class analysis (LCA) showed that the five criteria aggregated statistically into a syndrome.
This study confirmed the internal construct validity of the frailty phenotype that defined the low energy expenditure domain with the objective measurement of physical activity.
Viewing frailty as a 'latent vulnerability' in older people this study aims to derive a model based measurement of frailty and examines its internal reliability in community dwelling elderly.
20 Similar to a previous validation study, 21 only the second part, ie, the part used to determine the level of frailty, was tested for its internal consistency.
FA is used to identify the structure underlying all the frailty indicators and provides more internal reliability to the measure by controlling for measurement error, as it analyzes only the variability in an indicator that is shared among the other indicators (common variance without error or unique variance) while PCA assumes that all variability in an indicator should be used in the analysis.
While this sampling might limit generalizability, it does not affect internal validity, as the discordance between measured and perceived frailty did not change based on time-on-dialysis.
The CHS frailty phenotype has been shown to have satisfactory internal validity in the Canadian Study of Health and Aging [ 10].
The GFI has demonstrated high internal consistency and construct validity when compared to the Tilburg Frailty Indicator and the Sherbrook Postal Questionnaire [ 13].
