A 50-year-old man with heart failure (ejection fraction 35% on echocardiography) on metoprolol and lisinopril completes a new 12-item questionnaire designed to measure medication adherence. He denies chest pain and maintains blood pressure of 128/82 mmHg with heart rate 68/min. Investigators want to assess whether the questionnaire items are internally consistent and measure the same underlying construct of adherence. Which statistical measure is most appropriate for evaluating this psychometric property?
- A)Kappa statistic
- B)Standardized mortality ratio
- C)Cronbach alphaGABARITO
- D)Pearson correlation coefficient
- E)Hazard ratio
Explicação
Cronbach alpha assesses internal consistency, meaning how closely related the items on a scale are to one another. It is commonly used when developing multi item questionnaires intended to measure a single latent construct such as adherence or depression. High... Ver explicação completa e trilha adaptativa →