Comparing Alternative Rasch-Based Methods vs Raw Scores in Measuring Change in Health

Abstract

The evidence from the current study suggests that there may be some gains in sensitivity to change of outcome measures from different Rasch-based scoring approaches.

Influence of photodynamic therapy for age related macular degeneration upon subjective vision related quality of life

“…Rasch analysis has been applied widely to patientcentred outcomes in ophthalmology including the VF-14 [33,35] and outcome measures for refractive surgery [22] and low vision rehabilitation [30]. The use of Rasch analysis in measuring health outcomes has suggested improved validity in item inclusion, precision of measurement and more efficient instruments [21,35]. Our results illustrate that Rasch analysis removed some measurement noise in the raw data, which was chiefly due to disordering of response category usage.…”

Use of Patient-Reported Outcomes in the Context of Different Levels of Data*

“…Recently, Rasch analytic methodology has been proposed to overcome the limitations of Likert-based scoring of questionnaires that are used in orthopaedics 21 . Even advanced functioning and quality measurement instruments, such as SF-36 and EQ-5D, have some limitations.…”

Depressive symptoms in mid‐pregnancy, lifetime stressors and the 5‐HTTLPR genotype

“…Measurement properties of items (stressor questions) such as unidimensionality of the underlying construct and its subconstructs were investigated using appropriate infit and outfit statistics (Chang & Gehlert 2003;Norquist et al 2004). These statistics evaluated whether each of the stressor questions contributed to measurement of a one-dimensional latent variable.…”