Psychometric Evaluation of the Parkinson’s Disease Activities of Daily Living Scale

Abstract

Objective To evaluate a set of psychometric properties (i.e., data completeness, targeting, and external construct validity) of the Parkinson's disease Activities of Daily Living Scale (PADLS) in people with Parkinson's disease (PD). Specific attention was paid to the association between PADLS and PD severity, according to the Hoehn & Yahr (H&Y) staging. Methods The sample included 251 persons with PD (mean age 70 [SD 9] years). Data collection comprised a self-administered postal survey, structured interviews, and clinical assessments at home visits. Results Data completeness was 99.6% and the mean PADLS score was 2.1. Floor and ceiling effects were 22% and 2%, respectively. PADLS scores were more strongly associated (rs > 0.5) with perceived functional independence, ADL dependency, walking difficulties, and self-rated PD severity than with variables such as PD duration and cognitive function (rs < 0.5). PADLS scores differed across H&Y stages (Kruskal-Wallis test, p < 0.001). Those in H&Y stages IV-V had more ADL disability than those in stage III (Mann–Whitney U test, p < 0.001), whereas there were no significant differences between the other stages. Conclusion PADLS revealed excellent data completeness, acceptable targeting, and external construct validity. It seems to be well suited as a rough estimate of ADL disability in people with PD.

Longitudinal association between housing accessibility and activities of daily living: the role of self-efficacy and control in people ageing with Parkinson’s disease

“…In previous studies, HCQ showed comparable satisfactory internal consistency of the subscales in 66-69 and 65-91 year olds, and good testretest reliability in 65-91 year olds in Germany [30]; internal consistency in the HHPD baseline sample was acceptable [31]. For the current study, the total score combining two scales was dichotomised at 50% cut-off into low [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] and high (34-80) external HCB. GSE was assessed by the self-administered 10-item General self-efficacy Scale [32] at T1.…”

“…The respondents were asked to tick the one of five descriptions, which best described how Parkinson's disease had affected their day-to-day activities in the last month (scores 1-5, higher = more difficulty/dependence). PADLS is a reliable and valid measure of ADL in people with PD [25,26]. For this study, PADLS scores were dichotomised into no/mild difficulties (original scores 0-1 = score 0) or moderate/ severe/extreme difficulties (original scores 3-5 = score 1), which is a principle used in previous studies [26,27].…”

“…The GSE Scale has demonstrated satisfactory internal consistency, test-retest reliability and construct validity in people with PD in Sweden [33]. For the current study, the total score was dichotomised at a 50% cut-off into low [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and high [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] GSE.…”

“…Based on previous literature [26,[34][35][36][37][38][39][40][41][42], several sociodemographic and clinical characteristics were included in the analyses as covariates because they have shown associations with ADL and/or different aspects of housing in people with PD or older adults.…”

Self-Management Education for Persons with Parkinson’s Disease and Their Care Partners: A Quasi-Experimental Case-Control Study in Clinical Practice

“…), comorbidities, and perceived general health according to item 1 of the RAND-36 questionnaire ("poor" through "excellent," scored 0-4) [56,57]. PwPD also rated their difficulties in daily life using the PD Activities of Daily Living Scale (PADLS; "no difficulties" through to "extreme difficulties," scored 1-5) [58,59], perceived burden due to PD ("none at all" through to "extreme," scored 0-4), frequency of memory problems according to item 32 of the PDQ-39 ("never" through to "always," scored 0-4) [60,61], and provided information on the presence or absence of motor fluctuations and dyskinesias, time since diagnosis, number of daily medication intakes, and current medical PD therapy.…”