Patient-reported outcome measure
ODI Calculator
Oswestry Disability Index
The Oswestry Disability Index measures how far low back pain restricts ten everyday activities, scoring each section from 0 to 5 and expressing the total as a percentage from 0% (no disability) to 100% (maximum disability).
What the ODI score means
ODI scores run from 0 to 100, where a lower score is better. The bands below are conventional reporting categories, not diagnostic cut-offs.
- Minimal disability0–20
Able to cope with most activities of living. Usually no treatment indicated beyond advice on lifting, posture and fitness.
- Moderate disability20.1–40
More pain and difficulty with sitting, lifting and standing. Travel and social life are more difficult. Usually managed conservatively.
- Severe disability40.1–60
Pain is the principal problem, and activities of daily living are affected. These patients require detailed investigation.
- Crippled60.1–80
Back pain impinges on all aspects of life. Positive intervention is required.
- Bed-bound, or symptom magnification80.1–100
These patients are either bed-bound or exaggerating their symptoms. Careful evaluation is recommended.
Clinically important thresholds
A change in score only matters if it exceeds the smallest difference patients actually notice. Every threshold below is reported with the population it was derived in — a threshold quoted without its population is not usable.
| Type | Value | Subscale | Population | Follow-up | Source |
|---|---|---|---|---|---|
| MCID | 10 percentage points | — | Chronic low back pain | — | Fairbank JC 2000 |
| MCID | 12.8 points | — | Lumbar spine surgery | 1 year | Copay AG 2008 |
| MCID | 30% change from baseline | — | Low back pain, IMMPACT consensus recommendation | — | Ostelo RW 2008 |
| MDC | 10–15 points | — | Chronic low back pain | — | Davidson M 2002 |
MCID is the smallest change a patient perceives as meaningful. PASS is the score above which patients consider their state acceptable. SCB is a substantial rather than minimal benefit. MDC is the smallest change exceeding measurement error.
How the score is calculated
Stated in full so the calculation can be independently checked, and reproduced by hand if needed.
Each of the ten sections offers six statements scored 0 to 5, where 0 is the least and 5 the most disabled response. The section scores are added together and expressed as a percentage of the maximum possible: ODI % = (total score ÷ (number of sections answered × 5)) × 100. If a patient completes all ten sections the denominator is 50; if one section is left blank the denominator becomes 45, and so on. A higher percentage means greater disability.
Missing data
If a section is not completed, the denominator is reduced by 5 rather than the missing section being scored zero — this is the developer’s published rule and it exists mainly because the sex life section is often skipped. At least 9 of the 10 sections should be completed for a reliable score.
Instrument profile
- Developer
- Jeremy Fairbank and colleagues
- Institution
- Nuffield Orthopaedic Centre, Oxford, United Kingdom
- First published
- 1980
- Custodian
- MAPI Research Trust distributes the current version
- Items
- 10
- Response format
- 10 sections, six statements each, scored 0–5
- Score range
- 0 to 100
- Direction
- Lower score = better
- Recall period
- Today
- Completion time
- About 5 minutes
- Age range
- Adults
- Regions
- Spine
- Conditions
- Low back pain, Chronic low back pain, Lumbar disc herniation, Lumbar spinal stenosis, Spondylolisthesis
- Procedures
- Lumbar discectomy, Lumbar fusion, Decompression, Conservative back rehabilitation
- Languages
- English, Spanish, German, French, Dutch, Turkish, Chinese, 40+ validated translations
- Test–retest (ICC)
- 0.83–0.99
- Internal consistency
- Cronbach's alpha 0.71–0.87
- Validity
- Correlates strongly with the Roland-Morris questionnaire (r ≈ 0.8) and with pain visual analogue scales. Widely treated as the reference standard for back-specific disability.
- Responsiveness
- Highly responsive in surgical populations and the most commonly reported outcome in lumbar spine trials, which makes it the most comparable measure across the literature.
- Ceiling effect
- Ceiling effect is uncommon; scores above 80% usually warrant evaluation for symptom magnification, as the developer’s own banding notes.
- Floor effect
- Floor effect in mild or primary care populations, where the Roland-Morris discriminates better below roughly 20%.
Normative values
Reference values from published cohorts, for comparison against the score you calculated.
| Population | Age | Mean | SD |
|---|---|---|---|
| General population without back pain | — | 0–10% | — |
| Primary care low back pain at presentation | — | 20–40% | — |
| Pre-operative lumbar fusion | — | 45–60% | — |
When to use the ODI
Well suited to
- Lumbar spine surgery, where it is the dominant outcome measure and therefore the most comparable with published series.
- Chronic or severe low back pain, where it discriminates better than the Roland-Morris.
- Any study needing a percentage score directly comparable with the large ODI literature.
Limitations and poor fits
- Mild or acute primary care back pain, where the floor effect limits discrimination — use the Roland-Morris instead.
- Neck pain, for which the Neck Disability Index is the adapted equivalent.
- Where the sex life section would cause offence or distress and cannot be omitted cleanly, although the scoring rule does accommodate skipping it.
ODI compared with other instruments
Instruments measuring a related construct, with the practical difference between them.
| Instrument | Items | Range | What it adds |
|---|---|---|---|
| RMDQ | 24 | 0–24 | The Roland-Morris Disability Questionnaire measures physical disability from low back pain by counting how many of 24 statements a patient agrees with, giving a score from 0 (no disability) to 24 (maximum disability). |
Copyright and permitted use
Published openly because it is the question every clinician and researcher asks before using an instrument, and almost nobody answers it.
The ODI is reproduced very widely in textbooks, guidelines and trials, and is commonly described as free for clinical use. Copyright is nevertheless asserted, and distribution of the current version 2.0 is handled by the MAPI Research Trust. We have not obtained written confirmation of permitted commercial use, so treat this as requiring your own check before using it in a funded study or a commercial product.
References
- Fairbank JC, Couper J, Davies JB, O’Brien JP. The Oswestry low back pain disability questionnaire. Physiotherapy. 1980.PMID 6450426
- Fairbank JC, Pynsent PB. The Oswestry Disability Index. Spine. 2000.PMID 11074683
- Davidson M, Keating JL. A comparison of five low back disability questionnaires: reliability and responsiveness. Physical Therapy. 2002.PMID 11784274
- Copay AG, Glassman SD, Subach BR, Berven S, Schuler TC, Carreon LY. Minimum clinically important difference in lumbar spine surgery patients. The Spine Journal. 2008.PMID 18201937
- Ostelo RW, Deyo RA, Stratford P, et al.. Interpreting change scores for pain and functional status in low back pain: towards international consensus regarding minimal important change. Spine. 2008.PMID 18165753
Editorial status
Not yet reviewedQueued for clinical review by Sam Tuffun, PT, DPT. Sign-off has not taken place — this is a placeholder assignment, not a completed review.