The IIC item evaluation points to where the item provides its overall information. In the corresponding IIC graphs, the information provided by the summation of the item categories can be noted. In the ICC graphs for the polytomous responses concerning the frequency of difficulty falling asleep, it can be appreciated that the item thresholds are comparatively aggregated in the region of Theta = +1. The IIC curve depicts the information location and strength provided by the item, compared to other questionnaire items, along the same spectrum, based upon the information provided by each ICC curve. For each ICC curve, the inflection point represents the location of item thresholds along the spectrum of responding (“Theta”) where near-neighbor responders were 50% likely to endorse a more severe or less severe item category. These graphs display parent polytomous and child dichotomous item characteristic curves obtained as a part of deriving dichotomous cutpoints for the ISQ questions. Item Characteristic Curve (ICC) and Item Information Curve (IIC) Illustration. Further evaluation of the ISQ, including validation against clinical interviews, is warranted. The high specificities suggest that the ISQ has a high probability of correctly identifying those without insomnia and would be a cost-effective tool in large observational studies in which the prevalence of insomnia is likely to be about 10%. ![]() The ISQ captures the multidimensionality of insomnia better than traditional sleep measures as it ascertains symptoms of insomnia that are based on DSM-IV and RDC criteria. Concurrent validity was not confirmed with any of the traditional sleep summary measures (kappas < 0.30). The ISQ had high specificity (> 90%), but sensitivity, PPV, NPV, and LRs varied according to which sleep measure was used. Reliability was established with Cronbach alpha (alpha = 0.89). The ISQ identified 9.8% of the sample as meeting insomnia, consistent with established diagnostic criteria. The internal consistency and criterion validity of the dichotomized ISQ were compared to traditional measures of sleep from sleep diaries, polysomnography, and the Pittsburgh Sleep Quality Index using kappa statistics, and indices of sensitivity, specificity, positive and negative predictive value (PPV), and likelihood ratio tests (LRs). This yielded a dichotomous outcome consistent with the presence/absence of insomnia. The ISQ was evaluated using IRT algorithms in a cohort of 362 pre-, peri- and post-menopausal women recruited for the SWAN (Study of Women's Health Across the Nation) Sleep Study. Many people don’t realize that specific symptoms of insomnia can be addressed with therapy before trying medication.The objective was to psychometrically evaluate the Insomnia Symptom Questionnaire (ISQ), a self-report instrument designed to establish a clinically relevant case definition of insomnia consistent with widely used insomnia classification criteria, using methods from classical test theory and item response theory (IRT). Take these results to a licensed professional counselor when you go in and discuss your sleep issues. Insomnia can impact so many different parts of our lives. The intention of this screening is to give you an idea if insomnia is a possibility for you. Insomnia can also increase anxiety about sleep resulting in increased insomnia. Worry and anxiety can keep you up at night. Whether you have situational worries or struggle with anxiety, it can lead to insomnia.Regulating your body’s clock can decrease insomnia. Dysregulated body clock or circadian rhythm. Your body clock dictates the amount of time you sleep.We need to build up our sleep drive throughout the day in order to rest well at night. ![]() Decreased sleep drive: this is your deep sleep function.There are three sleep patterns that can cause insomnia: Sleep can impact multiple mental health conditions, but it can be hard to manage sleep. For many people, the key to mental health is sleep.
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