| Variable name | Definition | Values |
| activity | Type of activity | 1=walking; 2=descending stairs; 3=ascending stairs; 4=driving; 77=clapping; 99=non-study activity |
| time_s | Time in seconds from device initiation | Measured in hundredths of seconds |
| lw_x | Left wrist x-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| lw_y | Left wrist y-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| lw_z | Left wrist z-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| lh_x | Left hip x-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| lh_y | Left hip y-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| lh_z | Left hip z-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| la_x | Left ankle x-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| la_y | Left ankle y-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| la_z | Left ankle z-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| ra_x | Right ankle x-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| ra_y | Right ankle y-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |
| ra_z | Right ankle z-axis | Acceleration measured with respect to Earth's gravity (g = 9.81 meters per squared second) |