The accompanying summary data on skeletal-muscle CS activity (nmol/min/mg) appeared in the article “Impact of Lifelong Sedentary Behavior on Mitochondrial Function of Mice Skeletal Muscle” (J. of Gerontology, 2009: 927–939):

Old Old Young Sedentary Active Sample size 10 8 10 Sample mean 46.68 47.71 58.24 Sample sd 7.16 5.59 8.43 Carry out a test to decide whether true average activity differs for the three groups. If appropriate, investigate differences amongst the means with a multiple comparisons method.