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Height Z score grouped by age in Hb H and in Hb H-CS patients. Height Z-score (dashed line) was reduced (< −1 SD) in all Hb H-CS age groups while normal in Hb H patients <21 years old −(solid line). A discrepancy in height scores in subjects ≥21 years is noted, possibly reflecting different rates of improved growth velocity after reaching puberty.
