Table 1 Activity measure calculations
Domain | Measure | Calculation |
|---|---|---|
Activity volume | Average Steps/Day | \(\frac{\#\mathrm{ steps taken over valid recording period}}{\mathrm{number of valid recording days}}\) |
Average Time Walking/Day | \(\frac{\#\mathrm{ minutes walking over valid recording period}}{\mathrm{number of valid recording days}}\) | |
Activity frequency | Average Number of Short Bouts/Day (< 40 steps) | \(\frac{\#\mathrm{ short walking bouts over valid recording period}}{\mathrm{number of valid recoridng days}}\) |
Average Number of Long Bouts /Day (≥ 300 steps) | \(\frac{\#\mathrm{ long walking bouts over valid recording period}}{\mathrm{number of valid recording days}}\) | |
Average Number of Bouts/Day | \(\frac{\#\mathrm{ walking bouts over valid recording period}}{\mathrm{number of valid recording days}}\) | |
Activity intensity | Peak 30 | \(\frac{\mathrm{average steps}/\mathrm{minfor }30\mathrm{ highest minutes each day}}{\mathrm{number of valid recording days}}\) |
Average Bout Cadence | \(\frac{\mathrm{sum of steps}/\mathrm{minfor all active bouts}}{\mathrm{number of active bouts}}\) | |
Sedentary behavior | Percent Sedentary Time | (\(\frac{\#\mathrm{ sedentary minutes over valid recording period}}{\mathrm{total wear time over valid recording period}}\))*100 |
Average Number of Long Sedentary Bouts/Day (≥ 30 min) | \(\frac{\#\mathrm{ of long sedentary bouts over valid recording period}}{\mathrm{number of valid recording days}}\) | |
Fragmentation Index | \(\frac{\mathrm{number of sedentary bouts }\ge 5\mathrm{minover valid recording period}}{\mathrm{total number of sedentary minutes over valid recording period}}\) |