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Count/minute tertiles (T1<195; T2 195 to 278; T3>278). METS/hours/week tertiles (T1<1; T2 1 to 17.5; T3>17.5). P-values by Kruskal-Wallis test: a) counts/min p<0.001; b) METS/hour/week p<0.05.
