• Pain · Aug 2011

    Multicenter Study

    Multinomial logistic regression analysis for differentiating 3 treatment outcome trajectory groups for headache-associated disability.

    • Kristin Nicole Lewis, Bernadette Davantes Heckman, and Lina Himawan.
    • Department of Psychology, Ohio University, Athens, OH, USA.
    • Pain. 2011 Aug 1;152(8):1718-26.

    AbstractGrowth mixture modeling (GMM) identified latent groups based on treatment outcome trajectories of headache disability measures in patients in headache subspecialty treatment clinics. Using a longitudinal design, 219 patients in headache subspecialty clinics in 4 large cities throughout Ohio provided data on their headache disability at pretreatment and 3 follow-up assessments. GMM identified 3 treatment outcome trajectory groups: (1) patients who initiated treatment with elevated disability levels and who reported statistically significant reductions in headache disability (high-disability improvers; 11%); (2) patients who initiated treatment with elevated disability but who reported no reductions in disability (high-disability nonimprovers; 34%); and (3) patients who initiated treatment with moderate disability and who reported statistically significant reductions in headache disability (moderate-disability improvers; 55%). Based on the final multinomial logistic regression model, a dichotomized treatment appointment attendance variable was a statistically significant predictor for differentiating high-disability improvers from high-disability nonimprovers. Three-fourths of patients who initiated treatment with elevated disability levels did not report reductions in disability after 5 months of treatment with new preventive pharmacotherapies. Preventive headache agents may be most efficacious for patients with moderate levels of disability and for patients with high disability levels who attend all treatment appointments.Copyright © 2011 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.

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