Table 3 Descriptive statistics of the eight recorded biometric variables. Lengths were recorded in millimetres (mm). Strengths were recorded in kilograms (kg). The values displayed for the strengths are taken from the measurements from the user’s dominant hand.
From: Hafted technologies likely reduced stone tool-related selective pressures acting on the hominin hand
Biometric Variable | Mean | SD | Minimum | Maximum | Range | Skewness |
|---|---|---|---|---|---|---|
Age | 27.23 | 10.57 | 20.00 | 71.00 | 51.00 | 3.32 |
Hand length | 177.59 | 11.53 | 158.80 | 221.00 | 62.20 | 1.80 |
Thumb (D1) length | 59.59 | 5.54 | 50.71 | 71.78 | 21.07 | 0.39 |
Index (D2) length | 67.65 | 3.99 | 60.84 | 76.24 | 15.40 | 0.17 |
Middle (D3) length | 74.06 | 5.20 | 64.00 | 87.15 | 23.15 | 0.04 |
1D:2D ratio | 0.88 | 0.06 | 0.76 | 0.99 | 0.22 | 0.15 |
grip Strength | 32.44 | 11.15 | 16.40 | 63.40 | 47.00 | 0.88 |
pad-to-side pinch strength | 6.39 | 1.41 | 4.08 | 10.27 | 6.19 | 0.63 |
Tip-to-tip pinch strength | 4.21 | 1.23 | 1.90 | 7.00 | 5.10 | 0.46 |
