Functional Status Questionnaire

Abstract

The Functional Status Questionnaire (FSQ) is a concise, multidimensional instrument designed to measure health status and functional capacity, primarily utilized in primary care settings. Developed to screen for and monitor changes in functional disability, the FSQ assesses performance across key areas of daily life. These domains include physical function (covering both basic and intermediate Activities of Daily Living (ADL)), psychological function (mental health), and social/role function (work performance, social activity, and quality of interaction). The FSQ is valued for its brevity and its ability to provide clinicians with a broad overview of a patient’s self-reported functional limitations during the preceding month.

Keywords

Functional Status, Activities of Daily Living, ADL, Intermediate ADL, Mental Health, Social Function, Role Function, Health Status, Questionnaire, Primary Care, Quality of Life.

Authors

A.M. Jette, A.R. Davies, P.D. Cleary, L.V. Rubenstein, R.T. Young, et al.

Purpose

The primary purpose of the Functional Status Questionnaire (FSQ) is the efficient and reliable assessment of functional disability and health-related quality of life in adult populations, particularly those managed in outpatient or primary care environments. The instrument is intended for use as a screening tool to identify patients who may require more intensive evaluation or intervention due to functional limitations. By quantifying difficulties across physical, mental, and social domains, the FSQ helps practitioners track patient progress, evaluate the effectiveness of clinical interventions, and identify specific areas of functional decline or improvement.

The scale was developed to overcome limitations of earlier, more narrowly focused instruments by integrating multiple dimensions of function into a single, comprehensive yet practical tool. Its design emphasizes ease of administration and scoring, making it suitable for routine clinical application where time and resources may be limited.

Construct

The FSQ measures the broad construct of Functional Status, which reflects an individual’s ability to perform routine tasks and fulfill expected social roles. This construct is broken down into several measured domains:

• Physical Function: Assesses independence in mobility and self-care, divided into Basic ADL (essential self-maintenance tasks) and Intermediate ADL (tasks requiring greater mobility and community interaction, such as shopping or strenuous activity).
• Psychological Function: Focuses on Mental Health, assessing emotional states such as nervousness, happiness, calmness, and feelings of depression or despondency over the past month.
• Social/Role Function: Measures the capacity to engage in expected life roles, including Work Performance (for those employed), Social Activity (visiting friends/relatives, community participation), and Quality of Interaction (managing interpersonal relationships, irritability, or isolation).

Validity

Initial studies establishing the FSQ’s utility, particularly by Jette, Davies, and Cleary (1986), confirmed its validity when used in primary care settings. The instrument demonstrates strong construct validity, as evidenced by the correlation of its subscales with other established measures of function and health status. Furthermore, the FSQ exhibits criterion validity, successfully differentiating between patient groups based on known levels of illness severity or functional impairment. The structure of the questionnaire, separating physical health status from mental and social well-being, is supported by its ability to independently capture variance across these distinct dimensions of health.

Reliability

The FSQ generally exhibits acceptable to strong internal consistency reliability, as quantified by Cronbach’s Alpha coefficients across its major subscales. The reported reliability figures indicate that the items within each domain consistently measure the intended construct:

• Basic ADL: Alpha values range from 0.77 to 0.84.
• Intermediate ADL (IADL): Alpha values range from 0.82 to 0.89.
• Mental Health: Alpha values range from 0.77 to 0.88.
• Social Activity: Alpha values range from 0.65 to 0.83.
• Quality of Social Interaction: Alpha values are lower, ranging from 0.42 to 0.79.

While most scales show robust reliability, the slightly lower alpha range for Quality of Social Interaction suggests that this subscale may have less internal homogeneity compared to the physical and mental health domains, although it is still generally acceptable for group comparisons.

Factor Analysis

Although specific factor loading details are often elaborated in specialized psychometric reviews, the structure of the FSQ implies a multi-factor solution corresponding to the five core subscales identified: Basic ADL, Intermediate ADL, Mental Health, Social Activity, and Quality of Social Interaction. The distinct grouping of items into these separate categories supports the conceptualization of health status as a composite of independent physical, psychological, and social factors. This structure allows researchers and clinicians to assess differential impairment rather than relying solely on a single global functional score.

Instrument

Test Type: Self-report health status and functional disability questionnaire.

Format: A mix of multi-item scales utilizing Likert-type response options (ranging from 4 to 6 points, depending on the domain) and several single-item questions.

Language Available: Primarily developed and validated in English (US).

Population Group: Patients receiving care in general medical or primary care settings.

Age Group: Adults (items concern work and complex activities like driving/shopping).

Population Details: Used effectively across diverse adult populations to screen for functional impairment associated with chronic illness or general health decline.

Test Methodology: Patients respond based on their experiences during the preceding month. Scoring involves summing or averaging responses within subscales, with specific items (indicated by an asterisk in the item list) being reverse-scored to maintain score consistency (where a higher score indicates better function).

Keywords

Functional Status Questionnaire, FSQ, Physical Function, Psychological Function, ADL, IADL, Psychometrics, Health Assessment, Disability Screening, Reliability.

Authors

Author ORCID Identifier: Not provided in source materials.

Affiliation Email addresses: Not provided in source materials.

Correspondence Address: Not provided in source materials.

Permissions & Fee and Test Year

The Functional Status Questionnaire was initially published and validated in 1986 (Jette et al.). Information regarding current licensing fees should be sought from the primary authors or copyright holders. This instrument is frequently cited and used in research settings.

The full instrument is available in PDF format. The original PDF can be downloaded here: www.a4ebm.org/sites/default/files/Measuring%20Health.pdf

A second PDF containing the instrument is also available here: http://geriatrictoolkit.missouri.edu/funct/FSQ.pdf

Reference’s

1. Jette, A.M., Davies, A.R., Cleary, P.D., et al. (1986). The Functional Status Questionnaire: reliability and validity when used in primary care. Journal of General Internal Medicine, 1(3):143–149.
2. Jette, A.M., Cleary, P.D. (1987). Functional disability assessment. Phys Ther, 67:1854–1859.
3. Rubenstein, L.V., Calkins, D.R., Young, R.T., et al. (1989). Improving patient function: a randomized trial of functional disability screening. Ann Intern Med, 111:836–842.
4. Cleary, P.D., Jette, A.M. (2000). Reliability and validity of the Functional Status Questionnaire. Qual Life Res, 9:747–753.
5. McDowell, Ian. (2006). Measuring Health: A Guide to Rating Scales and Questionnaires, Third Edition. OXFORD UNIVERSITY PRESS.

Items of the Functional Status Questionnaire

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

Physical function:

Basic activities of daily living (ADL)

During the past month have you had difficulty:

1. Taking care of yourself‚ that is‚ eating‚ dressing or bathing?
2. Moving in and out of a bed or chair?
3. Walking indoors‚ such as around your home?

Intermediate ADL

4. Walking several blocks?
5. Walking one block or climbing one flight of stairs?
6. Doing work around the house such as cleaning‚ light yard work‚ home maintenance?
7. Doing errands‚ such as grocery shopping?
8. Driving a car or using public transportation?
9. Doing vigorous activities such as running‚ lifting heavy objects or participating in strenuous sports?

Responses (Items 1–9): usually did with no difficulty (4)‚ some difficulty (3)‚ much difficulty (2)‚ usually did not do because of health (1)‚ usually did not do for other reasons (0).

Psychological function:

During the past month:

Mental health

10. Have you been a very nervous person?
11. Have you felt calm and peaceful?*
12. Have you felt downhearted and blue?
13. Were you a happy person?*
14. Did [Do] you feel so down in the dumps that nothing could cheer you up?

Responses (Items 10–14): all of the time (1)‚ most of the time (2)‚ a good bit of the time (3)‚ some of the time (4)‚ a little of the time (5)‚ none of the time (6).

Social/role function:

During the past month have you: Work performance (for those employed‚ during the preceding month)

15. Done as much work as others in similar jobs?*
16. Worked for short periods of time or taken frequent rests because of your health?
17. Worked your regular number of hours?*
18. Done your job as carefully and accurately as others with similar jobs?*
19. Worked at your usual job‚ but with some changes because of your health?
20. Feared losing your job because of your health?

Responses (Items 15–20): all of the time (1)‚ most of the time (2)‚ some of the time (3)‚ none of the time (4).

Social activity

21. Had difficulty visiting with relatives or friends?
22. Had difficulty participating in community activities‚ such as religious services‚ social activities‚ or volunteer work?
23. Had difficulty taking care of other people such as family members?

Responses (Items 21–23): Usually did with no difficulty (4)‚ some difficulty (3)‚ much difficulty (2)‚ usually did not do because of health (1)‚ usually did not do for other reasons (0).

Quality of interaction

24. Isolated yourself from people around you?
25. Acted affectionate toward others?*
26. Acted irritable toward those around you?
27. Made unreasonable demands on your family and friends?
28. Gotten along well with other people?*

Responses (Items 24–28): all of the time (1)‚ most of the time (2)‚ a good bit of the time (3)‚ some of the time (4)‚ a little of the time (5)‚ none of the time (6).

Single item questions:

29. Which of the following statements best describes your work situation during the past month? Responses: working full-time; working part-time; unemployed; looking for work; unemployed because of my health; retired because of my health; retired for some other reason.
30. During the past month‚ how many days did illness or injury keep you in bed all or most of the day? Response: 0–31 days.
31. During the past month‚ how many days did you cut down on the things you usually do for one-half day or more because of your own illness or injury? Response: 0–31 days.
32. During the past month‚ how satisfied were you with your sexual relationships? Responses: very satisfied; satisfied; not sure; dissatisfied; very dissatisfied; did not have any sexual relationships.
33. How do you feel about your own health? Responses: very satisfied; satisfied; not sure; dissatisfied; very dissatisfied.
34. During the past month‚ about how often did you get together with friends or relatives‚ such as going out together‚ visiting in each other’s homes‚ or talking on the telephone? Responses: every day; several times a week; about once a week; two or three times a month; about once a month; not at all.

An asterisk (*) indicates items for which scores are reversed.