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NCT Number: NCT06031207

Translation and Psychometric Properties of the Fatigue Severity Scale in Patients With Fibromyalgia

The study will employ a Cross-Sectional Validation Study design. The study will be conducted at the Department of Physical Therapy, University of Lahore Teaching Hospital, located on Defence Road, Lahore.

The anticipated duration of the study will be 09 months, commencing after the approval of the synopsis.

The sample size will be determined following the Kline Method, resulting in a total of 90 participants.

A Purposive Sampling Technique will be utilized to select the study participants.

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Key information

Conditions

Fibromyalgia Muscular Diseases Musculoskeletal Diseases Nervous System Diseases Neuromuscular Diseases Rheumatic Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

University of Lahore Teaching Hospital

Lahore, Punjab Province, 55150, Pakistan

About this study

Study Type: Cross-Sectional Validation Study Location: Department of Physical Therapy, University of Lahore Teaching Hospital, Defence Road, Lahore Duration: 06 months (post-synopsis approval) Sample Size: 90 participants Sampling Technique: Purposive Sampling Consent and Ethics: Participants will provide written informed consent. Ethics approval will be obtained from the University of Lahore Ethics Committee.

Translation of FSS:

The Fatigue Severity Scale (FSS) will be translated into Urdu for data collection.

Two independent bilingual translators will create reports on translation difficulties and rationale.

These reports will inform a consensus meeting to develop a unified Urdu version, with comments documented.

The unified version will be backtranslated into English by native English-speaking translators unaware of the questionnaire's concept.

Expert Committee:

An expert committee comprising physical therapists, linguists, and a methodologist will review both language versions.

The goal is to ensure semantic, idiomatic, experiential, and conceptual equivalence and reach consensus on the final Urdu version of the FSS.

Patient Involvement:

The final Urdu FSS version will be administered to 20 fibromyalgia patients. These patients will also be interviewed to assess their understanding of questionnaire items.

Participants will receive additional information about fibromyalgia to prevent confusion.

Data Collection:

Data will be collected from 100 fibromyalgia patients using the final Urdu FSS version.

A retest will be conducted after 48 hours.

Additional Assessment:

All 90 participants will complete the Multidimensional Fatigue Inventory (MFI).

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Both genders with age of 18 years and above
  • Diagnosed and referred patients of fibromyalgia according to the American College of Rheumatology (ACR) criteria.
  • The ability to provide informed consent and wiling to participate in the study.
  • Fluency in the study language (i.e. Urdu in this case).

Exclusion criteria

  • Any other chronic pain condition that could affect fatigue and sleep.
  • Diagnosed sleep disorder (such as sleep apnea or insomnia) that could affect the results.
  • History of a psychiatric disorder that could affect the results.
  • History of substance abuse.
  • Participation in any other study that could affect the results at the time of recruitment.

Treatment and study plan

Primary outcomes

  1. Fatigue Severity Scale

    Time frame: 1 week

    The Fatigue Severity Scale (FSS) is a self-reported measure of fatigue and sleep disturbance in patients with fibromyalgia. It is a 9-item scale that assesses the severity of fatigue, the impact of fatigue on daily activities, and the degree of sleep disturbance. The FSS is a widely used instrument in research and clinical practice, and has been found to be a valid and reliable measure of fatigue and sleep disturbance in patients with fibromyalgia. The FSS items are rated on a 5-point Likert scale, with responses ranging from "not at all" to "extremely." The total score ranges from 0 to 36, with higher scores indicating greater levels of fatigue and sleep disturbance.

  2. Multidimensional Fatigue Inventory

    Time frame: 1 week

    The Multidimensional Fatigue Inventory (MFI) is a self-report questionnaire designed to assess various dimensions of fatigue experienced by individuals. It is commonly used in research and clinical settings to measure and understand fatigue in different contexts. Respondents answer a series of questions related to each dimension on a Likert-type scale, typically ranging from 1 to 5 or 0 to 4. The scores from each dimension are summed to obtain subscale scores, and a total score is often calculated by summing all subscale scores. Higher scores indicate greater levels of fatigue.

Sponsors and collaborators

Lead sponsor

University of Lahore

Other

Registry information

Important dates

Study start
2023
Primary completion
2023
Study completion
2024
First posted
Sep 11, 2023
Registry last updated
Aug 11, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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