Demographics by individual at each age in the younger and older cohorts.

aParticipants transitioned from Tanner 1 to 2 at 10 years (n = 5), 11 years (n = 6), and 12 years (n = 5). bParticipants transitioned from Tanner 1 to 3 at 11 years (n = 1). cParticipants transitioned from Tanner 2 to 3 at 12 years (n = 1) and 13 years (n = 1). dParticipants transitioned from Tanner 3 to 4 at 11 years (n = 2), 13 years (n = 1), and 15 years (n = 1). eParticipants transitioned from Tanner 3 to 5 at 11 years (n = 2). fParticipants transitioned from Tanner 4 to 5 at 15 years (n = 3) and 16 years (n = 1). Notes: if more than one Morningness/Eveningness score was collected at each age, then the mean score was used; Tanner stage was unavailable for 1 participant at ages 9, 11, and 13 years, and for 2 participants at age 15 years. Demographics by individual at each age in the younger and older cohorts.