Univariate analysis suggested these children tended to be younger ( 8.5 1.4 years vs 9.3 1.5 years ; P = .023 ) , to have higher myopic spherical equivalent ( SE ) at baseline ( -3.6 1.3 D vs -2.8 1.4 D ; P = .015 ) , and to have 2 myopic parents ( 77.3 % vs 48.1 % ; P = .012 ) .