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Mid-parental height: boys = (father's height + mother's height + 5 inches) / 2; girls subtract 5 inches instead. Target range is ±2 inches of mid-parental height. Growth plates fuse at 16–18 in girls and 18–21 in boys. Bone age X-ray provides a more accurate prediction. Nutrition, sleep, and chronic illness can shift actual height above or below genetic potential.
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