Free Insomnia severity index score SEO Content Brief & ChatGPT Prompts

Insomnia Severity Index (ISI) is a seven‑item self‑report questionnaire scored 0–28 that classifies insomnia severity: 0–7 (no clinically significant insomnia), 8–14 (subthreshold), 15–21 (moderate clinical insomnia), and 22–28 (severe clinical insomnia). Each item is rated 0–4 on sleep onset, sleep maintenance, early morning awakening, satisfaction with sleep, interference with daytime functioning, noticeability by others, and distress about sleep. An ISI score provides a standardized numeric value for baseline assessment and repeated measurement; most clinical trials and practice guidelines use the scale’s 0–28 range and these band cutoffs for screening and monitoring response. It is widely used for baseline screening and outcome monitoring.

The ISI works by aggregating seven 0–4 item responses into a single ISI score that reflects both nocturnal symptoms and daytime impact, which makes it practical as an insomnia assessment tool in primary care and behavioral sleep medicine. Developed by Charles Morin and colleagues and validated against sleep diaries and measures such as the Pittsburgh Sleep Quality Index, the ISI correlates with subjective sleep latency and wake after sleep onset while remaining distinct from objective measures like polysomnography. Its sensitivity to change supports use in CBT-I, stepped-care algorithms and medication trials; guidelines from the American Academy of Sleep Medicine reference the score when triaging treatment intensity.

A common clinician error is treating the ISI as a standalone diagnostic test rather than a decision-support score; interpretation requires clinical correlation with history, comorbid psychiatric or medical conditions and sleep diary data. When learning how to score ISI and interpret ISI, map bands to interventions: an ISI of 15–21 (moderate) typically indicates initiation of multi-component CBT-I as first‑line treatment and regular ISI monitoring, while a score ≥22 or persistent functional impairment warrants specialty referral or combined behavioral-plus-medication approaches. Special-population notes alter thresholds: older adults often respond to adapted CBT-I with caution regarding sedative prescribing, pregnancy limits pharmacotherapy options, and comorbid major depression or OSA necessitate integrated care. Trials commonly use a ≥6‑point ISI reduction as a meaningful treatment response. Insurance and safety considerations may influence pharmacologic choices and dosing.

Clinicians can implement the ISI by scoring the seven items at baseline, documenting the numeric ISI score in the chart, mapping the band to a treatment plan (watchful waiting or sleep hygiene for 8–14, CBT-I treatment planning for 15–21, consider combined treatment or referral for ≥22), and repeating the ISI at intervals to detect a ≥6‑point clinically meaningful change. Using the ISI alongside sleep diaries, PHQ-9 and screening for OSA increases diagnostic precision and safety. Documentation also supports quality metrics and integration into the electronic health record. This page provides a structured, step-by-step framework.