Multidimensional Fatigue Index

Abstract

The Multidimensional Fatigue Index (MVI-20), or Multidimensionele Vermoeidheids Index, is a critical self-report instrument designed to assess the severity and multidimensional nature of fatigue, particularly in clinical populations. Fatigue is recognized as the most significant residual complaint among cancer patients, with reported prevalence rates ranging from 60% to 96% during or following cancer treatment. The MVI-20 comprises twenty statements related to five core dimensions of fatigue and their resulting consequences, providing a comprehensive profile for clinical and research applications.

Keywords

Fatigue, Cancer-related fatigue, MVI-20, Psychometrics, Self-report, Quality of life, Multidimensional assessment, Chronic illness.

Authors

Smets EMA, Garssen B, Bonke B, de Haes JCJM (1995).

Purpose

The primary purpose of the MVI-20 is to provide a detailed, multidimensional assessment of subjective fatigue. Unlike scales that treat fatigue as a single, unitary construct, the MVI-20 aims to differentiate between various facets of fatigue, allowing clinicians and researchers to pinpoint specific areas of distress, such as physical exhaustion versus cognitive difficulties.

This differentiation is crucial for tailoring interventions, especially in chronic illness populations like those undergoing or recovering from cancer treatment. By capturing the scope and severity across distinct domains, the scale facilitates a more nuanced understanding of the patient experience and functional limitations related to fatigue.

Construct

The MVI-20 is grounded in the theoretical construct that fatigue is a complex, multidimensional phenomenon, not merely physical exhaustion. It operationalizes this construct through five distinct yet correlated dimensions, each assessed by four items, totaling twenty items (MVI-20).

These five dimensions capture the experiential and behavioral consequences of fatigue:

• General Fatigue: Reflects overall feelings of tiredness, weariness, and lack of energy.
• Physical Fatigue: Relates specifically to difficulties performing physical tasks and feeling physically drained.
• Reduced Activity: Measures the behavioral consequence of fatigue, specifically the decrease in the initiation and execution of daily activities.
• Reduced Motivation: Assesses the loss of drive, interest, and desire to engage in tasks or social interactions.
• Cognitive Fatigue: Focuses on mental exhaustion, difficulty concentrating, and problems with memory or clear thinking.

Validity

The MVI-20 has demonstrated robust construct validity across diverse clinical populations, notably in oncology, rheumatology, and chronic fatigue syndrome (CFS). Studies typically confirm that the five hypothesized dimensions are distinct yet interrelated, supporting the multidimensional theoretical framework.

Furthermore, the scale exhibits strong concurrent validity, showing significant correlations with established measures of mood disturbance (e.g., depression and anxiety scales) and overall quality of life indicators. Known-groups validity is also frequently established, as the scale successfully distinguishes between fatigued clinical groups and healthy control groups, affirming its ability to measure the intended clinical phenomenon.

Reliability

The reliability of the MVI-20 is generally reported as high. Internal consistency, measured via Cronbach’s alpha, typically exceeds 0.90 for the total scale score and remains consistently above the acceptable threshold of 0.70 for the individual subscales. This indicates that the items within each dimension reliably measure the same underlying construct.

Test-retest reliability studies confirm the stability of the MVI-20 scores over short periods (e.g., two weeks) in stable patient populations, suggesting that the scale provides consistent measurement when the underlying level of subjective fatigue has not substantially changed.

Factor Analysis

The structure of the MVI-20 was initially established and subsequently confirmed using techniques such as Exploratory and Confirmatory Factor Analysis. These analyses consistently support the hypothesized five-factor model, demonstrating that the twenty items load appropriately onto their designated subscales (General, Physical, Activity, Motivation, and Cognitive).

This robust factor structure is essential for maintaining the scale’s utility as a multidimensional assessment tool, ensuring that the subscale scores are meaningful indicators of specific dimensions of fatigue rather than merely reflections of a single, global fatigue factor.

Instrument

Test Type: Questionnaire (Vragenlijst)

Format: 20 self-report items scored on a Likert scale.

Language Available: Originally developed in Dutch (Multidimensionele Vermoeidheids Index). Widely translated and validated in English and numerous other languages globally.

Population Group: Clinical populations experiencing chronic illness or treatment side effects, particularly oncology patients.

Age Group: Adults and Elderly.

Population Details: Applicable for individuals capable of self-reporting subjective experiences related to general tasks and demands (Algemene taken en eisen).

Test Methodology: Self-administered paper-and-pencil or digital questionnaire. Items are typically scored on a 5-point scale (e.g., ranging from ‘Yes, that is true’ to ‘No, that is not true’).

Keywords

MVI-20, Oncology, Chronic illness, Psychometrics, Assessment, Cognitive functioning, Physical health, Motivation reduction.

Authors

Author ORCID Identifier: Not provided in source documentation.

Affiliation Email addresses: Contact details must be sought through primary research publications.

Correspondence Address: Refer to the original publication by Smets et al. (1995) for current correspondence details.

Permissions & Fee and Test Year

Test Year: 1995

Permissions & Fee: The MVI-20 is a widely cited and utilized instrument in academic and clinical settings. Users should consult the original authors or copyright holders (e.g., institutional review boards or publishers) regarding specific licensing fees and permissions for commercial or large-scale clinical use.

Reference’s

The primary reference for the scale is:

• Smets EMA, Garssen B, Bonke B, de Haes JCJM. The Multidimensional Fatigue Inventory (MFI-20): psychometric qualities of an instrument to assess fatigue. Journal of Psychosomatic Research, 1995; 39(3): 315-325.

The explanatory form (Toelichtingsformulier) for the MVI-20 can be downloaded here: MVI-20 Explanatory Form (PDF)

The measurement instrument (Meetinstrument) itself can be downloaded here: MVI-20 Measurement Instrument (PDF)

Items of the Multidimensionele Vermoeidheids Index / Multidimensional Fatigue Index

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way. The source content provided for this entry did not contain the 20 specific statements or items of the MVI-20. However, the scale assesses the following five dimensions:

• Algemene vermoeidheid (General Fatigue)
• Lichamelijke vermoeidheid (Physical Fatigue)
• Reductie in activiteit (Reduced Activity)
• Reductie in motivatie (Reduced Motivation)
• Cognitieve vermoeidheid (Cognitive Fatigue)