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Association of nWMH volume progression with baseline nWMH tertile, by box and whisker plot (the box borders are at the 25th and 75th percentiles, the middle bar is at the median, the whiskers extend to 1.5 interquartile ranges, and other values are represented by points). Statistical testing is by Spearman correlation coefficient. nWMH, white matter hyperintensity volume normalized to subject head size.
