2014 | 2015 | 2016 | 2017 | |||||

B | P value | B | P value | B | P value | B | P value | |

Gender | −0.286 | <0.001 | −0.279 | <0.001 | −0.253 | <0.001 | −0.244 | <0.001 |

Spherical equivalent | −0.158 | <0.001 | −0.316 | <0.001 | −0.465 | <0.001 | −0.562 | <0.001 |

Height | 0.307 | <0.001 | 0.263 | <0.001 | 0.215 | <0.001 | 0.226 | <0.001 |

Weight | −0.067 | 0.267 | −0.072 | 0.249 | −0.077 | 0.156 | −0.083 | 0.112 |

The mean age was 6.9±0.7 years, ranging from 6 to 8 years in 2014.