For aerobic steps per day, the interage correlations over the 4-yr period were all highly significant in all age-groups and ranged from 0.30 to 0.55 in women and from 0.28 to 0.53 in men, whereas the corresponding correlations over the 9-yr period were 0.23 to 0.49 and 0.26 to 0.52, respectively.
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