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4 time-use clusters were found in children: ‘Studious Actives’ had the best and ‘Potterers’ the worst Health Related Quality of Life - ‘Techno Actives’ and ‘Stay-home Screenies’ were in the middle.

In early adolescence, each additional hour of moderate-vigorous physical activity (MVPA) is associated with small increases in bone size and strength; and sedentary activity had little impact on bone.

Decreasing MVPA by 15 minutes had larger impacts on body composition than increasing MVPA by 15 minutes; body composition changes were not symmetrical.

While most parents and children show adequate sleep duration, poor quality (low efficiency) sleep is common.

More parents than children met physical activity guidelines, despite parents having lower mean activity counts, indicating a need to coordinate meaningful definitions across age groups.

Adverse sleep characteristics may play a limited role in shortening of telomeres in generally healthy populations up to at least