Fig. 4

The Comparison of Hip Joint Ultrasound Screening Results Between Preterm and Term Infants Across Four Screenings. A The first screening results showed that the abnormality rates of hip joints in preterm infants (19.1%) were significantly lower than those in term infants (31.7%) (p < 0.0001). B The second screening results indicated that preterm infants (16.3%) continued to have significantly lower abnormality rates compared to term infants (28.1%) (p < 0.0001). C In the third screening, the abnormality rates in preterm infants (2.5%) remained significantly lower than in term infants (6.2%) (p < 0.01). D By the fourth screening, the rates of hip joint abnormalities in preterm infants (0%) were still significantly lower than those in term infants (1.1%) (p < 0.05). ^*: p < 0.05, ^**: p < 0.01, ^****: p < 0.0001, chi-squared test