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. 2006 Dec 20;1(1):e90. doi: 10.1371/journal.pone.0000090

Table 2. Frequency of hand use during everyday activities.

graphic file with name pone.0000090.t002.jpg

EXPERIMENT 2
group age [years] number of subjects data points [0.5/sec] mean acceleration [mG] calculated laterality index EHI laterality index
left arm right arm
25 27.31±1.51 13 6014±599.28 30.62±3.03 38.61±3.85 0.11±0.01 85.00±8.60
50 52.44±1.02 9 4752±304.63 37.44±4.30 47.53±6.26 0.11±0.01 87.78±2.22
70 72.86±9.97 14 6093±606.42 20.63±2.00 23.78±2.68 0.06±0.01 88.57±2.75

Group data summarizing the assessment of the frequency of hand-use during everyday activities (mean acceleration in mG for the left and right arms). The laterality indices (index) showed a significant reduction with increasing age (Pearson correlation, r = −0.447, p = 0.007), indicating a loss of dominant hand superiority in everyday activities. In contrast, the EHI-scores (Edinburgh Handedness Inventory) remained unaffected by age (Pearson correlation, r = 0.009, p = 0.960).