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Development And Validation Of A Priori Risk Model For Extensive White Matter Lesions In People Age 65 Years Or Older: The Dijon MRI Study

P. Tully, Sarah Qchiqach, E. Pereira, S. Debette, B. Mazoyer, C. Tzourio
Published 2017 · Medicine

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Objectives The objective was to develop and validate a risk model for the likelihood of extensive white matter lesions (extWML) to inform clinicians on whether to proceed with or forgo diagnostic MRI. Design Population-based cohort study and multivariable prediction model. Setting Two representative samples from France. Participants Persons aged 60–80 years without dementia or stroke. Derivation sample n=1714; validation sample n=789. Primary and secondary outcome measures Volume of extWML (log cm3) was obtained from T2-weighted images in a 1.5 T scanner. 20 candidate risk factors for extWML were evaluated with the C-statistic. Secondary outcomes in validation included incident stroke over 12 years follow-up. Results The multivariable prediction model included six clinical risk factors (C-statistic=0.61). A cut-off of 7 points on the multivariable prediction model yielded the optimum balance in sensitivity 63.7% and specificity 54.0% and the negative predictive value was high (81.8%), but the positive predictive value was low (31.5%). In further validation, incident stroke risk was associated with continuous scores on the multivariable prediction model (HR 1.02; 95% CI 1.01 to 1.04, P=0.02) and dichotomised scores from the multivariable prediction model (HR 1.28; 95% CI 1.02 to 1.60, P=0.03). Conclusions A simple clinical risk equation for WML constituted by six variables can inform decisions whether to proceed with or forgo brain MRI. The high-negative predictive value demonstrates potential to reduce unnecessary MRI in the population aged 60–80 years.
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