Quality of design, methods and reporting of studies on psychometric properties (COSMIN ratings).

<p>COSMIN psychometric property boxes: A = internal consistency, B = reliability, C = measurement error, D = content validity, E = structural validity, F = hypothesis testing, G = cross-cultural validity, I = responsiveness. 4-point scale rating: +++ = excellent, ++ = good, + = fair, 0 = poor, empty space = COSMIN rating not applicable. IRT = item response theory; CTT = classical test theory.</p><p>Quality of design, methods and reporting of studies on psychometric properties (COSMIN ratings).