News Finding: Mitochondrial DNA copy number associated with all-cause mortality in multiethnic analysis 
Paper Finding: Furthermore, this association was not driven by any single component of the frailty phenotype, with three out of five frailty characteristics showing statistically significant association with lower mtDNA copy number in whites (Fig.
News Context: Mitochondrial DNA copy number associated with all-cause mortality in multiethnic analysis 
Paper Context: In a race-stratified analysis of samples from CHS, we observed a statistically significant association between lower mtDNA copy number and frailty, adjusted for age and sex, in whites (OR 0.91, 95 % CI 0.85-0.97, P = 0.005). Furthermore, this association was not driven by any single component of the frailty phenotype, with three out of five frailty characteristics showing statistically significant association with lower mtDNA copy number in whites (Fig. 1) , and a similar trend of association for the remaining characteristics.