... the phases of the study, design, recruitment of patients, data analysis,interpretation of results, and writing of the manuscript. JMQ supervised the study, participated in the interpretation of results ... Welch’s(Student’s)t-statistic. The t-te st is a two-sided test for the differ-ence between two means (i.e., the estimates) based on the standard error of the means (i.e., the standard error of the estimates). The ... indi-cations of the locations of those respondents along the latent trait of interest [37]. Therefore the probability of selecting an item response category indicative of betterhealth status...