Development and Testing of the Dysmenorrhea Symptom Interference (DSI) Scale
Chen X. Chen, Tabitha Murphy, Susan Ofner, Lilian Yahng, Peter Krombach, Michelle LaPradd, Giorgos Bakoyannis, Janet S. Carpenter
Abstract
Dysmenorrhea affects most reproductive-age women and increases the risk of future pain. To evaluate dysmenorrhea interventions, validated outcome measures are needed. In this two-phase study, we developed and tested the dysmenorrhea symptom interference scale. During the scale-development phase ( n = 30), we created a nine-item scale based on qualitative data from cognitive interviews. During the scale-testing phase ( n = 686), we evaluated reliability, validity, and responsiveness to change. The scale measures how dysmenorrhea symptoms interfere with physical, mental, and social activities. Internal consistency was strong with Cronbach’s α > 0.9. Test–retest reliability was acceptable ( r = 0.8). The scale showed satisfactory content validity, construct validity (supported by confirmatory factor analysis), concurrent validity, and responsiveness to change. The minimally important difference was 0.3 points on a scale with a possible total score ranging from 1 to 5. This new psychometrically sound scale can be used in research and clinical practice to facilitate the measurement and management of dysmenorrhea.