What makes a measurement instrument valid and reliable?

Cross-cultural adaptation of the Dutch Short Musculoskeletal Function Assessment questionnaire (SMFA-NL): Internal consistency, validity, repeatability and responsiveness

“…Knowledge of the amount of measurement error adds to the clinical relevance when outcome measurements are used for evaluative purposes, such as evaluating effect of surgery. 17 However, the minimally important changes on the SMFA have not been established yet.…”

“…16,17 The first step in exploring the internal consistency of the SMFA-NL was a factor analysis in order to determine whether the questionnaire actually consists of two subscales. Factor analysis is a technique designed to reveal whether or not the pattern of responses on a number of items can be explained by a smaller number of underlying factors, with each factor reflecting a different construct.…”

“…Additionally, the standard error of measurement (SEM), a measure of the instrument's absolute measurement error, was calculated. 17 The value of the SEM can be derived by dividing the SD of the mean differences between two measurements (SD diff ) by H2. 23 To estimate test-retest reliability of the SMFA-NL subscales, intraclass correlation coefficients (ICCs) with corresponding 95% CIs were calculated.…”

Health-related Quality of Life in Women with Breast Cancer: a Literature-based Review of Psychometric Properties of Breast Cancer-specific Measures

“…Table 1 summarizes the assessment of breast cancer-specific HRQL measures based on the paper by Terwee et al (Terwee et al, 2007) and Scholtes et al (Scholtes et al, 2011), which described the quality criteria for measurement properties of health status questionnaires. These criteria included content validity, criterion validity, construct validity, internal consistency, test-retest, responsiveness, floor and ceiling effects, and interpretability.…”

Propriedades Psicométricas De Instrumentos De Medidas: Bases Conceituais E Métodos De Avaliação - Parte I

“…4,7 In addition, other authors have described that, in addition to the two properties mentioned above, the quality of instrument measurement can be evaluated by the responsiveness that is defined as the instrument's ability to detect changes in patients' health status over time. 6,8 The adaptationof instruments for the evaluation of subjective constructs,for different languages and cultures, has also been the subject of a large number of investigations, including discussions on the appropriate methodological process to ensure that the instrument preserves its properties of validity and reliability after adaptation. 1 In the last decade, this type of research has produced a considerable number of nursing researches, [9][10][11][12][13] reflecting the concern of these professionals to identify the most appropriate measurement instrument for a given situation or condition, considering the one that addresses the monitoring of patients in clinical practice and that contemplates the perception of the individuals themselves in the evaluation of their state of health.…”