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(A) Vertical height changes of the instrumented segment show significant differences between groups at preoperative (PR) and first erect (FE) that disappear at 2 y (YR2). (B) The immature group had greater height gain at YR2, but this difference disappeared when normalizing by total body height gain. Between- and within-group comparisons were done using a Mann-Whitney U test with Bonferroni correction (P < 0.05). UIV-LIV, upper and lower instrumented levels.
