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In our previous studies, relevant factors concerning the main phenomena related to the process of initiating dialysis were examined in elderly patients with chronic renal failure. Examined phenomena were as follows: (1) the acceptance of dialysis; (2) the urgency of initiating dialysis; (3) short-term outcome; (4) returning home. Multivariate logistic regression analysis was used to determine relevant factors. Although we speculated that age should be a relevant factor for each phenomenon, the phenomenon on which age had some impact was only the first. We suspected the existence of a pitfall, through which the relation of age was lost in the second, the third, or the fourth phenomenon. The fact that every phenomenon had its own relevant factors was thought to be an important clue to the discovery of pitfalls. Relevant factors were derived from both the number of dropout-patients and their demographic and clinical status. From the viewpoint of nondropout-patients, the progression of the process of initiating dialysis might alter the characteristics of subjects for successive phenomena In this study, we set out to investigate whether alterations in the characteristics of subjects were pitfalls. Alterations were regarded as a fall of the mean age, an increment of the rate of the patients with ability to walk, and an increment of the rate of the patients with normal cognitive function. In addition, the old-old patients tended to have limited numbers of those who had the ability to walk and normal cognitive function. In other words, aging changes in ambulatory and cognitive function were not brought to subjects. These alterations may cause the loss of the relation of age to each phenomenon. Thus, we presumed these alterations to be pitfalls. We must clarify whether aging changes are brought to subjects beforehand in analyses that include the old-old patients as subjects.

nihon rōnen igakkai zasshi

A pitfall in analyses of relevant factors concerning phenomena in the process of initiating dialysis: Alterations in the characteristics of subjects diminish the significance of age