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Background Due to the importance of assessing quality of life (QoL) in healthy and ill adolescents, the evaluation of psychometric properties of these questionnaires is important. Objective To investigate the application of Rasch analysis in psychometric assessment studies on adolescents’ QoL instruments, and to evaluate the quality of reporting Rasch parameters in these studies. Methods This systematic review was conducted by searching for papers in electronic databases PubMed, Web of Science, EMBASE, Cochrane Library and Scopus until December 2018. Results After screening 122 papers, 31 remained in the study. Around 68% of the studies used the Rasch analysis for instrument testing and 32% for the development of new instruments. In 77.4% of studies, both classical and Rasch methods were used parallel to data analysis. In 32.2% of studies, healthy adolescents were the main target group. The most commonly used instrument in Rasch studies was, KIDSCREEN, administered in different countries. Six Rasch parameters were reported with a higher percentage in the studies. Major reported parameters of Rasch analysis were application of the software program (96.7%), test of item fit to the Rasch model (93.5%), unidimensionality (80.6%), type of the identified mathematical Rasch model (74.1%), threshold (58%) and differential item functioning (54.8%). Based on the psychometric evaluation of the QoL instruments, 71% of studies showed acceptable results. Conclusion The application of the Rasch model for psychometric assessment of adolescents’ QoL questionnaires has increased in recent decades. But, there is still no strong and commonly used critical appraisal tool or guideline for the evaluation of these papers.

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Aim and Objectives This study aimed to develop and examine psychometric properties of the safety feeling scale (SFS) in adult patients to assess their sense of safety during a hospital stay. Design Mixed methods design. A SQUIRE checklist was used. Methods This is a study with two phases of scale development and evaluation of the psychometric properties of the scale. In the first phase, the concept of ‘safety feeling’ was analysed using a hybrid model. Thus, a systematic review and then a qualitative study with hospitalized patients (n = 31) were conducted by conventional content analysis. In the psychometric phase, factorial validity, reliability, feasibility, and responsiveness of the scale were evaluated by different tests in various samples. Results After integrating the results of the systematic review and qualitative study, a scale item pool with 84 items was developed. In the psychometric phase, 12 items with four factors were specified; ‘effective care,’ ‘confidence in the healthcare team,’ ‘emotional enrichment’ and ‘hygienic facilities,’ explaining 51% of the total variance of the scale. They were confirmed by confirmatory factor analysis. Internal consistency and stability of the scale were satisfactory. Feasibility and responsiveness were also acceptable.