如何计算Insomnia Severity Index
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The Insomnia Severity Index (ISI) Calculator scores 7 items rated 0-4 to measure the nature, severity, and impact of insomnia, serving as both a screening tool and treatment outcome measure.
公式
ISI Total = Sum of 7 items (each 0-4); Range: 0-28
- TS
- Total ISI Score (points (0-28)) — Sum of all 7 items indicating insomnia severity
- Qi
- Item Score (points (0-4)) — Rating from 0 (none) to 4 (very severe) for each dimension
- SL
- Severity Level (category) — None (0-7), Subthreshold (8-14), Moderate (15-21), Severe (22-28)
分步指南
- 1Rate 7 items on a 0-4 scale covering: difficulty falling asleep, staying asleep, early awakening, sleep satisfaction, daytime impairment, noticeability of impairment, and distress about sleep
- 2Sum all 7 items for a total score of 0-28
- 3Severity categories: 0-7 no clinically significant insomnia, 8-14 subthreshold insomnia, 15-21 moderate insomnia, 22-28 severe insomnia
- 4A change of 6+ points indicates clinically meaningful improvement
例题解析
输入
Moderate difficulty falling asleep (2), moderate difficulty staying asleep (2), mild early waking (1), quite dissatisfied (3), moderately noticeable (2), moderate impairment (2), moderately distressed (2)
结果
ISI score: 14/28 — subthreshold insomnia (8-14); consider sleep hygiene intervention and monitoring
输入
All items rated 3 (quite a bit / very)
结果
ISI score: 21/28 — moderate clinical insomnia (15-21); recommend CBT-I or pharmacotherapy evaluation
常见错误注意事项
- ✕Using subjective sleep quality alone without considering the daytime impairment and distress items which are equally important
- ✕Not recognizing that an ISI change of 6 points (not just 1-2 points) constitutes reliable clinical improvement
- ✕Assuming insomnia severity correlates directly with hours of sleep — many insomnia patients sleep 6+ hours but with poor quality
常见问题
What ISI score means I have insomnia?
A score of 15 or above indicates moderate clinical insomnia warranting treatment. Scores of 8-14 suggest subthreshold insomnia where sleep hygiene and behavioral interventions may help prevent progression.
What is the best treatment for insomnia?
Cognitive Behavioral Therapy for Insomnia (CBT-I) is the first-line treatment recommended by all major medical guidelines. It is as effective as medication short-term and superior long-term, with typical ISI reductions of 8-12 points.
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