Methods: We performed a reanalysis of a previous study database that was carried out by our group and was approved by Ethical Committee. The mentioned study included 65 adult patients with intermittent claudication which did not need assistive devices for ambulation. The reanalysis included data from physical examination, arterial stiffness (carotid-femoral pulse wave velocity – CF-PWV) and functional capacity (six minute walk test). The construct validation was carried out through Rasch Analysis. The concept of construct validity is useful to explain the nature of the nursing diagnosis. In this context, the nursing diagnosis is a defined variable which is placed in a concept system whose relations are explained by a theory. The Rasch analysis is taken as a criterion for the structure of the responses because it considers that the comparison of two people is independent of which items may be used within the set of items assessing the same variable.
Results: Skin color alteration was the most frequent defining characteristic, i.e., the item with the highest response probability. It measure was -2.54 logito. Skin temperature alteration was the less frequent defining characteristic, i.e., the item with the lowest response probability. It measure was 2.49 logito. CF-PWV and altered walking distance (AWD) response probabilities were 0.05 logito, i.e., very close to the average of items. All defining characteristics (n=14) had appropriate Infit values (between 0.7 and 1.3 logito). It means that they are well adjusted to the model. However, the Outfit values of altered left femoral pulse (FE) and CF-PWV were 2.33 and 1.63 logito, respectively. In other words, FE and CF-PWV seemed to not properly identify outlier patients. The biserial correlation of FE was -0.2, i.e., it did not belong to the group. Then, we decided to exclude FE of the analysis. It causes an alteration in the adjustment of altered right femoral pulse which, in turn, was excluded of analysis. Twelve items remained in the model. A new Rasch analysis was performed. The remained defining characteristics had good adjustment to the model. The items with the highest and lowest response probabilities were skin color alteration and skin temperature alteration. The probabilities of CF-PWV and AWD were -0.14 logito. Despite this, AWD had better adjustment than CF-PWV. No items had negative correlation or equal to zero. Model reliability was 0.62 and the separation was 1.27.
Conclusion: AWD and CF-PWV seem to contribute to IPTP construct whereas femoral pulses do not.
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