The authors investigated the psychometric properties of the subscales of the Self-Perception Profile for Children with item response theory (IRT) models using a sample of 611 children. Results from a nonparametric Mokken analysis and a parametric IRT approach for boys (n = 268) and girls (n = 343) were compared. The authors found that most scales formed weak scales and that measurement precisio...

OBJECTIVES To identify the associations between socioeconomic status (SES) and health-related quality of life (HRQOL) and the explanatory contribution of disease, patient and healthcare factors among patients with prostate cancer. DESIGN Prospective cohort study. SETTING AND PARTICIPANTS In all, 246 patients from 2 hospitals in Hamburg/Germany who underwent radical prostatectomy completed a...

Species distribution modeling (SDM) is an essential method in ecology and conservation. SDMs are often calibrated within one country's borders, typically along a limited environmental gradient with biased and incomplete data, making the quality of these models questionable. In this study, we evaluated how adequate are national presence-only data for calibrating regional SDMs. We trained SDMs fo...

background: the effect of poor psychosocial work conditions on health status has widely been discussed in occupational literature. job content questionnaire (jcq) is a widely accepted instrument for evaluation of psychosocial work conditions. objective: to determine the reliability and validity of persian version of jcq. methods: the questionnaire was translated into persian and back translated...