Sample characteristics of boys and girls in the Northern Finland Birth Cohort 1986.

a<p>Low preference for active play was defined as parents reporting that children liked to participate in active play ‘hardly ever’.</p>b<p>Metabolic equivalent-hours based on the intensity and volume of physical activity divided into gender-specific quintiles: 1) active (two highest quintiles), 2) moderately active (third and fourth quintiles) and 3) inactive (lowest quintile).</p>c<p>Peak oxygen uptake (VO<sub>2peak</sub>) in ml·kg<sup>−1</sup>·min<sup>−1</sup> divided into gender-specific quintiles: 1) high (two highest quintiles), 2) average (third and fourth quintiles) and 3) low (lowest quintile).</p>