Publication

The Construct Validity of Real-World Digital Mobility Outcomes in People with Chronic Obstructive Pulmonary Disease

Anisoara Ionescu
2026

Abstract

Background Recent advances in wearable technologies make it possible to accurately quantify real-world mobility performance through technically validated digital mobility outcomes (DMOs). Aim To evaluate the construct validity (convergent, divergent, and known-groups validity) of 24 DMOs quantifying walking activity (amount and pattern) and gait (pace, rhythm, and bout-to-bout variability) in people with chronic obstructive pulmonary disease (COPD). Methods Part of the Mobilise-D observational cohort study, people with COPD, recruited from seven European sites, wore an activity monitor for seven days during daily life. Functional capacity, health status, dyspnoea, lung function, quadriceps torque, and experience of difficulty with physical activity were used as constructs for convergent validity testing (Pearson/Spearman correlation coefficients). Diastolic blood pressure was used as an unrelated construct for divergent validity (criterion: |r|

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https://infoscience.epfl.ch/entities/publication/1e076ab6-b768-443c-b130-6cc8deea36ad

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Anisoara Ionescu
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1e076ab6-b768-443c-b130-6cc8deea36ad

About this result

Related concepts (32)

Construct validity

Construct validity concerns how well a set of indicators represent or reflect a concept that is not directly measurable. Construct validation is the accumulation of evidence to support the interpretation of what a measure reflects. Modern validity theory defines construct validity as the overarching concern of validity research, subsuming all other types of validity evidence such as content validity and criterion validity.

Validity (statistics)

Validity is the main extent to which a concept, conclusion or measurement is well-founded and likely corresponds accurately to the real world. The word "valid" is derived from the Latin validus, meaning strong. The validity of a measurement tool (for example, a test in education) is the degree to which the tool measures what it claims to measure. Validity is based on the strength of a collection of different types of evidence (e.g. face validity, construct validity, etc.) described in greater detail below.

Concurrent validity

Concurrent validity is a type of evidence that can be gathered to defend the use of a test for predicting other outcomes. It is a parameter used in sociology, psychology, and other psychometric or behavioral sciences. Concurrent validity is demonstrated when a test correlates well with a measure that has previously been validated. The two measures may be for the same construct, but more often used for different, but presumably related, constructs. The two measures in the study are taken at the same time.

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The Construct Validity of Real-World Digital Mobility Outcomes in People with Chronic Obstructive Pulmonary Disease

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