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Your Answers:
# Item Response
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Tags: Psychology , Psychometrics
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Insomnia Severity Index is a brief questionnaire that reflects how sleep problems show up at night and how they spill into daytime. It helps you notice where difficulties cluster and whether the overall burden looks mild or more serious, so you can decide what to try next.

You answer seven items from none to very severe, then review a single total score alongside night and day patterns. A small example might be trouble staying asleep with some morning tiredness while overall impact remains modest. Repeating it after two weeks can show if changes are helping.

Clearer results come from answering consistently for the last two weeks and keeping units in mind when you reflect on routines like caffeine or light. Use similar conditions each time so comparisons are fair and look for shifts rather than perfect numbers.

Results are informational and not a diagnosis. If sleep issues affect safety, mood, or work, consider speaking with a qualified health care professional.

Technical Details:

The measure captures self‑rated difficulty across falling asleep, staying asleep, early waking, satisfaction with sleep, daytime impact, how noticeable problems are, and distress about sleep. A single total score summarizes severity, while night and day subscores highlight when the load is felt most.

Seven item ratings are combined into a total. A night subscore adds the first three items and a day subscore adds items five to seven. Satisfaction is item four and distress is item seven. Labels describe burden in plain terms to aid quick reading before you consider specific next steps.

Results are grouped into bands from no clinical concern through subthreshold to moderate and severe levels. Values near a band edge should be read in context, looking at the pattern of night versus day and which items drive the score.

Comparisons make the most sense within the same person over comparable weeks. The questionnaire reflects recent experience, not lifetime risk or causes. Environmental and medical factors can shift answers and should be considered when interpreting changes.

S = ∑ i=1 7 si
N= s1+s2+s3 D= s5+s6+s7
Symbol Meaning Unit/Datatype Source
S Total score integer 0–28 derived
N Night subscore (items 1–3) integer 0–12 derived
D Day subscore (items 5–7) integer 0–12 derived
si Item rating integer 0–4 input
s4 Satisfaction integer 0–4 input
s7 Distress integer 0–4 input

Worked example: ratings [2, 3, 1, 2, 2, 1, 2]

S=2+3+1+2+2+1+2=13 N=2+3+1=6 D=2+1+2=5

Interpretation: total 13 falls in the subthreshold band. Night and day subscores both read as mild; the highest night item is sleep maintenance.

Severity band Lower bound Upper bound Interpretation
No clinically significant 0 7 Little to no current insomnia burden.
Subthreshold 8 14 Mild symptoms; self‑care changes may help.
Clinical moderate 15 21 Meaningful symptoms; consider structured strategies.
Clinical severe 22 28 High burden; seek professional review.
Label Proportion of max For N or D (0–12) Implication
none 0–25 % 0–3 Little burden on this dimension.
mild >25 %–50 % 4–6 Occasional or modest burden.
moderate >50 %–75 % 7–9 Frequent or notable burden.
severe >75 %–100 % 10–12 High and persistent burden.

Pattern detection highlights the highest night item when it is at least moderate. If all three night items are below moderate, the pattern reads as low night symptom burden. Balance compares night and day and is considered even when the absolute difference is 2 or less.

Units, precision, and rounding

  • Item ratings are integers only; no decimals are used.
  • Total and subscore arithmetic uses base‑10 integers without rounding.
  • Displayed ranges use a period as the decimal separator when needed.

Validation and bounds

Field Type Min Max Step/Pattern
Item response integer 0 4 step 1
Encoded state r string — — ^[0-4\-]{7}$ (seven digits or dashes)

I/O formats and encoding

Input Accepted families Output Encoding/Precision
Seven ratings single‑choice 0–4 Total, severity band, night/day subscores, labels integers only
Answer exports copy to clipboard, CSV download, DOCX summary tabular answers with item text generated locally

Networking and storage

  • Processing occurs on the device; results render instantly without sending data to a server.
  • One charting script may load from a public CDN to draw the gauge.
  • Responses can be encoded in the URL parameter r to restore state.
  • Clipboard, CSV, and DOCX exports are created locally.

Performance and determinism

  • Computation is O(1) per change; identical inputs yield identical outputs.
  • Rendering scales to typical devices; the gauge resizes with the viewport.

Security and privacy

No data is transmitted or stored server side. Clipboard and file exports are initiated by you and stay on your device.

Assumptions and limitations

  • Self‑report introduces variability; answers reflect perception, not objective sleep staging.
  • Severity bands follow the implemented cut points, not a clinical diagnosis.
  • Heads‑up Pattern flags only the highest night item when at least moderate.
  • Heads‑up Balance is considered even only when |N–D| ≤ 2.
  • Subscale labels use coarse four‑level buckets; small changes may not shift labels.
  • Distress relies on a single item; context matters.
  • Satisfaction is a single item and may diverge from total burden.
  • Environmental and medical factors outside scope may drive scores.

Edge cases and error sources

  • Partial responses leave totals incomplete until all seven items are answered.
  • Non‑integer or out‑of‑range values are not accepted.
  • Altered URL state r that fails the pattern is ignored.
  • Clipboard permissions may block copy on locked systems.
  • File download policies can prevent CSV or DOCX writes.
  • Unavailable CDN scripting can omit the gauge while scores remain valid.
  • Very small screens may truncate long item text in tables.
  • High zoom or accessibility settings may reflow gauge labels.
  • Browser extensions that modify forms can interfere with inputs.
  • Network‑offline use is supported after first load; external scripts may need cache.

Privacy and compliance

This tool provides informational estimates and does not substitute professional advice.

Step‑by‑Step Guide:

Insomnia Severity Index scoring turns seven ratings into a total with night and day insights.

  1. Begin and answer each item for the last two weeks.
  2. Select one choice per item 0–4.
  3. Review the total score and severity band.
  4. Check night and day subscores for pattern and balance.
  5. Read highlights, next steps, and your answer table.
  6. Optionally copy or export your answers.

Example: If night is 8 and day is 4, focus on evening routine and consistency, then retest in two weeks.

You now have a clear snapshot and a direction for action.

FAQ:

Is my data stored?

No. Answers are handled on the device. Copies or downloads are created locally and remain under your control.

A URL code can restore state without sending responses to a server.
How accurate is the score?

It reflects recent self‑reported experience. Use it to track change over weeks and to guide discussion, not as a stand‑alone diagnosis.

What units or formats are used?

Each item is an integer from 0 to 4. Totals and subscores are sums without decimals. Exports include item text and selected labels.

Can I use it offline?

Yes after the page has loaded once. Exports and viewing results continue to work without a network connection.

What does “borderline” mean?

Scores near a band edge should be read with night versus day patterns and the highest items to decide whether to escalate action.

How do I export answers?

Use copy to clipboard for quick sharing, download a CSV for a table, or generate a DOCX summary when you need a document.

Is there a cost or license?

The page does not request payment. Any licensing that may apply to the underlying scale is outside the scope of this description.

Troubleshooting:

  • Nothing happens when selecting: ensure only one choice is picked per item.
  • Gauge missing: allow the page to load required resources or refresh once.
  • Copy fails: grant clipboard permission or try the CSV download.
  • CSV or DOCX blocked: check browser download settings or try another browser.
  • Long text wraps poorly: rotate the device or widen the window.
  • Restoring state fails: verify the URL code is exactly seven characters.

Advanced Tips:

  • Track at the same weekday and hour to reduce noise.
  • Pair scores with a simple sleep log for context.
  • Compare night and day subscores to choose first actions.
  • Look at the top night item to tailor wind‑down habits.
  • Reassess after two weeks to test whether changes stick.
  • Use exports to keep a record when discussing with a clinician.

Glossary:

Insomnia Severity Index
Seven‑item measure of insomnia burden over recent weeks.
Total score (S)
Sum of all seven item ratings.
Night subscore (N)
Sum of items 1 to 3 capturing night difficulties.
Day subscore (D)
Sum of items 5 to 7 capturing daytime impact.
Severity band
Category for S indicating overall burden.
Pattern
The most affected night area when at least moderate.
Balance
Difference between N and D used to judge symmetry.