Fig. 3

The Comparison of Hip Joint Ultrasound Screening Results Between Preterm and Term Infants with Different Birth Weight Percentiles. A During the first screening, the proportion of abnormal hip joints was significantly higher in term infants compared to preterm infants (P50–P75: 32.1 vs. 15.8%, P75–P90: 36.0 vs. 16.7%, p < 0.01; >P90: 32.1 vs. 15.8%, p < 0.05). B In the second screening, the proportions of abnormal hip joints in term infants with P50–P75 and P75–P90 were 27.6 and 34.8%, respectively, significantly exceeding those in preterm infants (13.9%, p < 0.05; 12.1%, p < 0.01). C For the third screening, term infants with P75–P90 had a significantly higher rate of abnormal hip joints at 11.2%, compared to 1.5% in preterm infants (p < 0.05). D By the fourth screening, there was no significant difference in the proportion of abnormal hip joints between preterm and term infants across different birth weight percentiles. ^*: p < 0.05, ^**: p < 0.01, chi-squared test