Measuring Insomnia Among Adolescents : Analysis of the Minimal Insomnia Symptom Scale (miss) with the Rasch Measurement Model

• Introduction : The Minimal Insomnia Symptom Scale (MISS) is a three-item screening instrument that has been found to be psychometrically sound and capable of screening for insomnia among adults and older people. This study aimed to test the measurement properties of the MISS together with an additional item focusing on daytime functioning among adolescents using the Rasch measurement model. Materials and Methods : A cross-sectional design were used, and data from adolescents (age 13-17 years, n=3022) was analyzed using the Rasch measurement model. Results : The MISS had good measurement properties. When replacing the original MISS item “not rested by sleep” with the item “daytime disturbance”, the measurement properties slightly improved. We label this new scale the MISS-Revised (MISS-R). The reliability was significantly better for the MISS-R (0.55) compared to the MISS (0.50). The optimal cut-off was found to be >6 points, both for the MISS and the MISS-R. Conclusions : This study provides general support that both the MISS as well as the MISS-R have good fit to the Rasch model. At this stage, neither the MISS nor the MISS-R can be advocated over the other for use among adolescents, although the MISS-R had slightly better reliability than the MISS. Additional studies are needed to determine the clinically optimal cut-off score for identification of insomnia.

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