%0 Journal Article
%T Effect of birth order on stereoacuity in Chinese preschool children: a cross-sectional study.
%A Han S
%A Zhang X
%A Li R
%A Tong H
%A Zhao X
%A Wang Y
%A Hao Q
%A Huang D
%A Zhu H
%A Zhang X
%A Liu H
%J BMJ Open
%V 10
%N 10
%D 10 2020 12
%M 33046460
%F 3.006
%R 10.1136/bmjopen-2019-032833
%X This study aimed to investigate the relationship between birth order and stereoacuity among Chinese children aged 60-72 months.<BR>Cross-sectional.<BR>1342 children with complete data on the questionnaire, stereoacuity and refraction were included.<BR>The mean stereoacuity was 53.2±1.7, 56.9±1.9 and 60.9±1.5 s of arc in the first-born group, second-born group and third-born group, respectively. Lower birth order was significantly correlated with better stereoacuity (p=0.036). Third-borns (OR=3.02, p=0.027) were at higher risk of having subnormal stereoacuity compared with first-borns in the multivariate analysis.<BR>Later-borns had poorer stereoacuity than first-borns.