Functional Status Index (FSI)
A self-report instrument designed to assess functional status in adults with arthritis, measuring dependence, pain, and difficulty across daily activities.
Scale Development & Technical Details
Scale Overview
The Functional Status Index (FSI) was developed by Alan M. Jette (1980). It is designed to measure Functional Status. The scale is intended for use with Adults with arthritis or osteoarthritis, older adults.
Scale Structure
This instrument consists of 18 items organized into 5 factors/subscales: Gross Mobility, Personal Care, Hand Activities, Home Chores, Other Activities.
| Factor / Subscale | Items | N |
|---|---|---|
| Gross Mobility | 1,2,3,4,5,6 | 6 |
| Personal Care | 7,8,9,10 | 4 |
| Hand Activities | 11,12,13 | 3 |
| Home Chores | 14,15,16 | 3 |
| Other Activities | 17,18 | 2 |
Response Format
Respondents rate each item using a 5-point Likert scale (1 = Strongly Disagree to 5 = Strongly Agree).
Scoring
Item scores are averaged to produce a mean score.
Total scores range from 1 to 5. Interpretation guidelines:
- Independent / No difficulty: 1 – 1
- Mild difficulty: 2 – 2
- Moderate difficulty: 3 – 3
- Severe difficulty / Dependent: 4 – 5
Psychometric Properties
Internal Consistency: The scale has demonstrated good to excellent internal consistency with reported Cronbach’s alpha values of Cronbach's alpha ranges from 0.64 to 0.96 across subscales.
Administration
The scale is self-administered and typically takes approximately 10 minutes to complete. It can be administered individually or in group settings. No special training is required for administration.