Table 6.

Time Points at Which the Difference between Became-Myopic Hours and Emmetropic Hours Were Significantly Different from 0, Overall and Within Ethnic Group

	Reading	Studying	Computer/Video Games	TV	Outdoor/Sports Activities	Diopter-Hours
Overall	0, +1, +2, +3, +5	0	−5*, 0, +1, +2, +3, +4, +5	+1, +2, +3, +4	−4, −3, −2, −1, 0, +1, +2, +3, +4	−1, 0, +1, +2, +3, +4, +5
African American	+3	+1		−4*		+1
Asian	0	+1*			−2, −1, 0, +1, +2, +3, +4
Hispanic	+2	−1, 0, +1, +2	0, +1, +2, +3	−3, 0, +1, +2, +3, +4	−4, −1, +1, +2	−4, −3, −2, −1, 0, +1, +2, +3
Native American				−1	−1*
White	+2, +3		0, +1, +2, +3, +4		−3, −2, −1, 0, +1, +2, +3	0, +1, +2, +3

0 = onset.

^*Direction of the difference was opposite to the overall effect.