Fig. 2

Flowchart of subjects’ inclusion of this study. Between January 2019 and January 2020, a total of 1,064 newborns were admitted to the neonatology department. Of these, 27 were excluded due to guardians not consenting to hip joint ultrasound screening, 34 had other associated deformities or diseases, and 48 were lost to follow-up. Ultimately, 955 newborns were included in the study, comprising 393 preterm infants and 562 term infants