Table 1. General characteristics of the study population.
| Total | Boys | Girls | |
|---|---|---|---|
| Population (%) | 119 (100.0) | 51 (42.9) | 68 (57.1) |
| Mean age in years (SD) | 12.5 (0.4) | 12.5 (0.5) | 12.5 (0.3) |
| Mean body height in cm (SD) | 154.9 (7.6) | 153.7 (7.7) | 155.9 (7.5) |
| Mean body weight in kg (SD) | 45.6 (9.2) | 45.4 (10.3) | 45.8 (8.3) |
| Mean BMI in in kg/m -2 (SD) | 18.9 (3.1) | 19.1 (3.4) | 18.8 (2.9) |
| Median daily wear time in h (IQR) | 12.7 (11.5–13.5) | 12.8 (11.1–13.5) | 12.7 (11.5–13.4) |
| Median daily hours of combined data (IQR) | 9.3 (6.7–10.6) | 9.4 (7.9–10.7) | 9.3 (6.6–10.5) |
SD, Standard Deviation; BMI, Body Mass Index; IQR, Interquartile Range