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Objectives : To identify and review prescription drugs approved in the US containing quality of life (QoL) terminology within the package inserts (PIs). Methods : The electronic Physician Desk Reference (PDR) was searched for the terminology 'Quality of Life' or 'QoL' as of December 2000. Summary...
Background : Item response theory (IRT) is a powerful framework for analyzing multiitem scales and is central to the implementation of computerized adaptive testing. Objectives : To explain the use of IRT to examine measurement properties and to apply IRT to a questionnaire for measuring migraine...
Background : Migraine and other severe headaches can cause suffering and reduce functioning and productivity. Patients are the best source of information about such impact. Objective : To develop a new short form (HIT-6) for assessing the impact of headaches that has broad content coverage but is...