Methods Cross-sectional study using the adapted and validated ISAAC Written Questionnaire for Asthma for telephone interview. The sample was the systematic random type without replacement for school classes and students. Data were collected by a polling company from May/ July 2010. Bivariate analyses between asthma ("wheezing in the last 12 months”) and the study factors were performed using od...

Methods In an RCT, 95 patients with CLBP were assigned to once or twice weekly yoga classes. Before randomization, we collected data on sociodemographics, low back pain intensity, Roland Morris Disability Questionnaire (RMDQ), SF-36, preference for once or twice weekly yoga, and expectations regarding the helpfulness of these treatments. Bivariate analyses using chi-square and student’s t-test ...

The logistic person response function (PRF) models the probability of a correct response as a function of the item locations. Reise (2000) proposed to use the slope parameter of the logistic PRF as a person-fit measure. He reformulated the logistic PRF model as a multilevel logistic regression model and estimated the PRF parameters from this multilevel framework. An advantage of the multilevel ...