Table 1.
Baseline characteristics.
Table 2.
Compliance during the study period.
Fig 1.
Factors related to daily physical activity and reference values.
A. Relationship between mean daily physical activity (95% CI) and age. B. Relationship between daily PA and sex. The interaction between age and sex was excluded from the model for this graph only. C. Relationship between daily rain duration and physical activity. D: estimated mean (95% CI) daily PA with varying ambient temperature. E: estimated mean (95% CI) physical activity for each day of the week. F: estimated mean daily PA for children living in a highly urbanized area (> 2000 people/km2) or a less urbanized area (< 2000 people/km2). G. 90% prediction interval of daily PA stratified by age and sex. Wear time (100%), rain duration (2h) and temperature (11°C) are held constant. Personalized predictions can be made using the model coefficients in S4 Table.
Fig 2.
Prediction interval of physical activity candidate endpoints.
Prediction interval of several physical-activity related candidate endpoints. Red and blue line represent the estimated mean for male subjects and female subjects, respectively. The shaded areas represent the 90% prediction intervals where watch wear time (100%), rain duration (2h) and temperature (11°C) are held constant.
Table 3.
Physical activity-related candidate endpoints.
Fig 3.
A: average (90% prediction interval) HR during daytime (blue). Average 95% CI nighttime HR (red). Reference values (10th– 90th percentile of HR per age year) are displayed in green. B: Average HR (95% CI) per hour of the day. C: estimated relationship between HR and step count for ages 2, 8, 12 and 16. A limited amount of age years is shown for readability.
Fig 4.
Accelerometer-derived sleep parameters.
A: mean (95% CI) sleep duration stratified by sex. B: mean (95% CI) sleep depth stratified by sex. C: mean (95% CI) wakeup count.