Determine criteria for generation of reliable estimates

[Anne-Linde]

Apply the 6-step process as method to derive sample-specific valid day criterion for both the MLM app and Axivity (hip and wrist) data (Bingham et al., 2016):

• [x] Step-1: determine minimum wear-time
• [x] Step-2: process 7-day-data
• [x] Step-3: determine the inclusion of a weekend day
• [x] Step-4: examine day-to-day variability
• [x] Step-5: calculate single day intraclass correlation (ICC) (2,1)
• [x] Step-6: calculate number of days required to reach reliability

References

1. Daniel D. Bingham, Silvia Costa, Stacy A. Clemes, Ash C. Routen, Helen J. Moore & Sally E. Barber (2016) Accelerometer data requirements for reliable estimation of habitual physical activity and sedentary time of children during the early years - a worked example following a stepped approach, Journal of Sports Sciences, 34:20, 2005-2010, DOI: 10.1080/02640414.2016.1149605

[Anne-Linde]

Check normality of all estimates. For app:

• [x] Time in PA (mean min/day)
• [x] Time in SB (mean min/day)
• [x] Time in sleep (mean min/day)

For accelerometer data:

• [x] average and 25th percentile acceleration (x, y and z), ENMO, MAD, intensity gradient for ENMO and MAD, iqlevels?

[Anne-Linde]

• [ ] Perform required day calculation (step 6 and 7) for different milestone achievements?