Supplementary Material for: Psychometric Performance of the Memory Complain Scale among Colombian Individuals of 60 Years and Older

<b><i>Introduction:</i></b> The Memory Complaint Scale (MCS-15) is a 15-item instrument to explore frequent forgetfulness in daily life in people with possible cognitive impairment. However, knowledge about its psychometric performance is limited. <b><i>Objective:</i></b> The objective of this study was to know the dimensionality and internal consistency of the MCS-15 in Colombian older adults. <b><i>Methods:</i></b> A probabilistic sample of 1,957 older adults from the general Colombian population was taken, aged between 60 and 98 years (mean = 71.0 ± 7.9), and 62.2% were women. Internal consistency (Cronbach’s alpha and McDonald’s omega) and dimensionality (exploratory and confirmatory factor analysis) were calculated for the original and ten-item versions. <b><i>Results:</i></b> The 15-item version showed Cronbach’s alpha and McDonald’s omega of 0.91, and one dimension accounted for 45.3% of the variance. A version of ten items showed Cronbach’s alpha and McDonald’s omega of 0.89 and a single factor that explained 50.9% of the variance with better indicators in the confirmatory factor analysis. Convergence with the shortened Mini-Mental State Examination was <i>r</i>_s = 0.43 (<i>p</i> &lt; 0.001), and the Montreal Cognitive Assessment test was <i>r</i>_s = 0.38 (<i>p</i> &lt; 0.001). The nomological validity with the geriatric depression scale was <i>r</i>_s = 0.44 (<i>p</i> &lt; 0.001), and women scored higher than men (<i>p</i> &lt; 0.001). <b><i>Conclusions:</i></b> The MCS-15 shows high internal consistency with poor dimensionality. However, a ten-item version shows high internal consistency and a clear one-dimensional structure. More research is needed: testing the performance against a structured interview for major cognitive impairment.