BACKGROUND Many researchers use observed questionnaire scores to evaluate score reliability and to make conclusions and inferences regarding quality-of-life outcomes. The amount of false alarms from medical diagnoses that would be avoided if observed scores were substituted with expected scores is interesting, and understanding these differences is important for the care of cancer patients. Usi...

OBJECTIVES: The QUALIOST (quality in life questionnaire in osteoporosis) is one of the most commonly used osteoporosis-specific health-related quality of life (HRQoL) questionnaires and it is often used in clinical studies to document the longitudinal impact of osteoporosis and related fractures. It is unknown whether the QUALIOST is better at estimating HRQoL for osteoporotic fracture patients...

This study articulates the construct of social presence and develops a social presence questionnaire for examining online collaborative learning with tests for reliability and validity. Questionnaire items were developed by revising the social presence questionnaire developed by Picciano in 2002 as well as reviewing research in the literature of computer support for cooperative systems (CSCW). ...

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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 translate...