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A total of 96 normally developing children, aged 5.7\u2009\u00b1\u20093.0 years old, 55 boys and 41 girls. They were divided into 3 groups: Pre-walking group, Walking group, and Post-walking group. Parameters: lumbar lordosis Angle (LLA), the sum of the lumbar disc wedge Angle (\u2211D), the sum of the lumbar vertebral body wedge Angle (\u2211B), disc height (DH).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>(1) LLA, \u2211D, \u2211B, and DHL<jats:sub>1<\/jats:sub>-S<jats:sub>1<\/jats:sub> were 33.2\u2009\u00b1\u20098.7\u00b0, 14.1\u2009\u00b1\u20098.6\u00b0, 11.9\u2009\u00b1\u20098.6\u00b0, and 6.9\u2009\u00b1\u20091.2\u00a0mm, 7.6\u2009\u00b1\u20091.4\u00a0mm, 8.2\u2009\u00b1\u20091.6\u00a0mm, 8.9\u2009\u00b1\u20091.7\u00a0mm, 8.5\u2009\u00b1\u20091.8\u00a0mm. (2) The difference in LLA values between the Pre-walking and the Post-walking group was statistically significant. DH were significantly different among the three groups. (3) In the Post-walking group, LLA value of girls was significantly higher than that of boys, and DHL<jats:sub>3\u2009\u2212\u20094<\/jats:sub> and DHL<jats:sub>4\u2009\u2212\u20095<\/jats:sub> values of girls were significantly lower than that of boys. (4) Age had a low positive correlation with LLA and \u2211D and a moderate to strong positive correlation with DH; LLA showed a moderate positive correlation with \u2211D, and a low positive correlation with \u2211B and DH.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Age and walking activity are the influencing factors of lumbar lordosis and disc thickening. Walking activity can significantly increase lumbar lordosis, and age is the main factor promoting lumbar disc thickening. DHL4-5 was the thickest lumbar intervertebral disc with the fastest intergroup thickening. 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Parents give informed consent to the examination of the fetus and child.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and informed consent"}},{"value":"The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this article.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}