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Knowing its prevalence, biometric parameters and risk factors is fundamental to children eye care. The purpose of this study was to determine the biometric components of aniso-astigmatism and associated maternal risk factors in Chinese preschool children.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      In the population-based, prospective cohort Nanjing Eye Study, children were measured for noncycloplegic refractive error using an autorefractor and for biometric parameters using an optical low-coherent reflectometry. The difference of total astigmatism (TA) between both eyes was calculated using cylinder power (non-vectorial aniso-TA was defined as \u22651.00 Dioptre Cylinder [DC] between both eyes) and by vector analysis (vectorial aniso-TA was defined as a difference of \u22650.5 in\n                      <jats:italic>J<\/jats:italic>\n                      <jats:sub>\n                        <jats:italic>0<\/jats:italic>\n                      <\/jats:sub>\n                      or\n                      <jats:italic>J<\/jats:italic>\n                      <jats:sub>\n                        <jats:italic>45<\/jats:italic>\n                      <\/jats:sub>\n                      between both eyes which is equivalent to 1.00\u2009DC). The prevalence of aniso-TA was presented. Interocular biometric parameters were compared between with vs. without aniso-astigmatism group. In addition, risk factors were determined using multivariate logistic regression model.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Of 1131 children (66.90\u2009\u00b1\u20093.38\u2009months, 53.31% male), the prevalence of non-vectorial aniso-TA was 1.95% (95% Confidence Interval (CI)\u2009=\u20091.14\u20132.75%), while the prevalence of vectorial aniso-TA was twice as common as non-vectorial aniso-TA, neither varying with sex or age. With aniso-TA eyes were more asymmetric in axial length and corneal curvature radius than without aniso-TA eyes. In multivariate logistic regression model, 5-min Apgar score less than 7 was significantly associated with higher risk of aniso-TA (vectorial aniso-TA: Odds Ratio (OR)\u2009=\u20096.42, 95%CI\u2009=\u20092.63\u201315.69,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001; non-vectorial aniso-TA: OR\u2009=\u20094.99, 95%CI\u2009=\u20091.41\u201317.68,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.01). Being twin or triple was significantly associated with higher risk of vectorial aniso-CA (OR\u2009=\u20092.43, 95%CI\u2009=\u20091.05\u20135.60,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.04). Pre-term delivery (OR\u2009=\u20092.60, 95%CI\u2009=\u20091.09\u20136.15,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.03) and post-term delivery (OR\u2009=\u20093.61, 95%CI\u2009=\u20091.31\u20139.96,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.01) were significantly associated with higher risk of vectorial aniso-CA.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Both corneal curvature radius and axial length asymmetry were correlated with aniso-TA. Children with 5-min Apgar score\u2009&lt;\u20097 were more likely to have aniso-TA, while twin or triple, pre-term or post-term delivery were more likely to have vectorial aniso-CA.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12886-021-01808-7","type":"journal-article","created":{"date-parts":[[2021,2,3]],"date-time":"2021-02-03T15:02:46Z","timestamp":1612364566000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["The biometric parameters of aniso-astigmatism and its risk factor in Chinese preschool children: the Nanjing eye study"],"prefix":"10.1186","volume":"21","author":[{"given":"Haohai","family":"Tong","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingfeng","family":"Hao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zijin","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yue","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoyan","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qigang","family":"Sun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaohan","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuejuan","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dan","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hu","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,2,3]]},"reference":[{"issue":"1","key":"1808_CR1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/j.ophtha.2017.10.003","volume":"125","author":"RS Chuck","year":"2018","unstructured":"Chuck RS, Jacobs DS, Lee JK, Afshari NA, Vitale S, Shen TT, et al. 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