Patient-reported outcome measure
Modified Oswestry Calculator
Modified Oswestry Low Back Pain Disability Questionnaire
The Modified Oswestry Low Back Pain Disability Questionnaire is the Oswestry with one change — an employment and homemaking section replaces the sex life section — scored the same way: ten sections rated 0 to 5, added and doubled to give a percentage from 0% (no disability) to 100% (maximum disability).
What the Modified Oswestry score means
Modified Oswestry 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.
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 to a raw total out of 50 and, when all ten sections are completed, the raw total is doubled to give a percentage. If a section is left blank, the raw total is divided by the number of sections completed multiplied by 5 and then multiplied by 100 — for nine completed sections, 22 out of 45 gives about 49%. A higher percentage means greater disability. The modification is confined to the last section: employment and homemaking replaces the sex life section of the Oswestry Disability Index, and the pain intensity section keeps the medication-based wording of the 1980 original. Printed copies of the questionnaire differ by a few words from one another, so check that a series you are comparing with used the same form.
Missing data
If a section is not completed, the denominator is reduced by 5 rather than the missing section being scored zero — the published rule. At least 9 of the 10 sections should be completed for a reliable score. Because the sex life section that was usually skipped has been replaced, a missing section is now uncommon.
Instrument profile
- Developer
- Julie M. Fritz and James J. Irrgang
- Institution
- University of Pittsburgh, United States
- First published
- 2001
- Custodian
- No single custodian; adapted from the original Oswestry questionnaire of Fairbank and colleagues
- 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
- Procedures
- Lumbar discectomy, Lumbar fusion, Decompression, Conservative back rehabilitation
- Languages
- English
- Test–retest (ICC)
- Reported as 0.90 (95% confidence interval 0.78 to 0.96) in the 2001 comparison with the Quebec Back Pain Disability Scale, as cited in later validation studies. We have not re-checked the figure against the original paper.
- Validity
- Developed in a physical therapy setting and compared directly with the Quebec Back Pain Disability Scale. The change to the employment and homemaking section was made because the sex life item was frequently left unanswered.
- Responsiveness
- Widely used to track change in physical therapy trials of low back pain. No minimal clinically important difference is shown here because we could not verify a published value for the modified version.
When to use the Modified Oswestry
Well suited to
- Physical therapy and rehabilitation settings where the modified form is the one used in the comparison literature.
- Whenever the sex life item of the standard Oswestry would go unanswered or be unwelcome, and a complete ten-section score is wanted.
Limitations and poor fits
- Comparing directly with a series that used the standard Oswestry Disability Index without noting the different last section — the two are highly similar but not interchangeable.
- Neck pain, for which the Neck Disability Index is the adapted equivalent.
- Mild or acute low back pain, where the floor effect limits discrimination — use the Roland-Morris questionnaire.
- Judging whether an individual patient has improved meaningfully: no minimal clinically important difference is shown here, so use a published threshold from your own population.
Modified Oswestry compared with other instruments
Instruments measuring a related construct, with the practical difference between them.
| Instrument | Items | Range | What it adds |
|---|---|---|---|
| ODI | 10 | 0–100 | 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). |
| 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). |
| NDI | 10 | 0–100 | The Neck Disability Index measures how far neck pain restricts ten everyday activities, scoring each section from 0 to 5 for a raw total out of 50, which is commonly doubled and reported as a percentage from 0% (no disability) to 100% (complete disability). |
| STarT Back | 9 | 0–9 | The STarT Back Screening Tool stratifies patients with low back pain into low, medium and high risk of persistent disabling pain using nine items, of which five form a psychosocial subscale, so that treatment can be matched to risk rather than given uniformly. |
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 modification is reproduced widely in clinics and the physiotherapy literature, and the form itself credits permission from the Chartered Society of Physiotherapy for the original Oswestry wording. We have not obtained written confirmation of permitted commercial use, so check before using it in a funded study or a commercial product.
References
- Fritz JM, Irrgang JJ. A comparison of a modified Oswestry Low Back Pain Disability Questionnaire and the Quebec Back Pain Disability Scale. Physical Therapy. 2001.doi:10.1093/ptj/81.2.776
- Fairbank JCT, Couper J, Davies JB, O’Brien JP. The Oswestry low back pain disability questionnaire. Physiotherapy. 1980.
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.