Intra-individual variability in day-to-day and month-to-month measurements of physical activity and sedentary behaviour at work and in leisure-time among Danish adults

The number of days needed to achieve 80% reliability in measuring sitting time was 4.7 days for work and 5.5 days for leisure time.

• Variability in accelerometer data on sedentary behavior and physical activity differs between work and leisure time.
• 4.0 days were required to reliably measure physical activity at work, while 6.8 days were needed for leisure time.
• Moderate-to-vigorous physical activity (MVPA) required 4.2 days for work and 5.8 days for leisure time for reliable measurement.
• The findings highlight the importance of understanding activity pattern variability for effective health monitoring.

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