(A) Head circumference (mean ±2 SD) for males with achondroplasia (shaded area) compared with normal male head circumference (mean ±2 SD). (B) Head circumference (mean ±2 SD) for females with achondroplasia (shaded area) compared with normal female head circumference (mean ±SD).
SD: standard deviation.
Reproduced from: Horton WA, Rotter JI, Rimoin DL, et al. Standard growth curves for achondroplasia. J Pediatr 1978; 93:435. Illustration used with the permission of Elsevier Inc. All rights reserved.
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