A study of measurement properties of the Life-Space Assessment questionnaire in older adults with chronic obstructive pulmonary disease

Abstract

Objective:

To test the measurement properties (reliability, interpretability, and validity) of the Life-Space Assessment questionnaire for older adults with chronic obstructive pulmonary disease.

Design:

Clinimetric study.

Setting:

Pneumology service, ambulatory care, São Paulo, SP, Brazil.

Participants:

Consecutive sample of older adults (n = 62; 38 (61%) men, 24 (39%) women) with chronic obstructive pulmonary disease.

Interventions:

Not applicable.

Main outcome measures:

Life-Space Assessment questionnaire assesses five space levels visited by the older adult in four weeks prior to the assessment. We tested the following measurement properties of this questionnaire: reliability (reproducibility assessed by a type-2,1 intraclass correlation coefficient (ICC_2,1); internal consistency assessed by the Cronbach’s alpha; measurement error by determining the standard error of measurement (SEM)), interpretability (minimum detectable change with 90% confidence (MDC₉₀); ceiling and floor effects by calculating the proportion of participants who achieved the minimum and maximum scores), and validity by Pearson’s correlation test between the Life-Space Assessment questionnaire scores and number of daily steps assessed by accelerometry.

Results:

Reproducibility (ICC_2,1) was 0.90 (95% confidence interval (CI): 0.84–0.94), and internal consistency (Cronbach’s α) was 0.80 (range = 0.76–0.80 for each item deleted). SEM was 3.65 points (3%), the MDC₉₀ was 0.20 points, and we observed no ceiling (2%) or floor (6%) effects. We observed an association between the score of the Life-Space Assessment questionnaire and daily steps (r = 0.43; P = 0.01).

Conclusion:

Life-Space Assessment questionnaire shows adequate measurement properties for the assessment of life-space mobility in older adults with chronic obstructive pulmonary disease.

Keywords

Life-space assessment older adult chronic obstructive pulmonary disease movement validation studies

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