Obesity in Children with Congenital Adrenal Hyperplasia in the Minnesota Cohort: Importance of Adjusting Body Mass Index for Height-Age

Abstract

Objectives

To evaluate obesity and overweight in children with congenital adrenal hyperplasia (CAH), and associations with glucocorticoids, fludrocortisone and disease control. Adjusting body mass index for-height-age (BMI_HA) percentile is proposed to correct misclassification of obese/overweight status in CAH children with advanced bone age and tall-for-age stature.

Design

Longitudinal.

Patients

194 children with CAH seen from 1970-2013: 124 salt-wasting (SW); 70 simple-virilizing (SV); 102 females.

Measurements

BMI endpoints were overweight (85-94%tile) and obese (≥95%tile).

Results

Approximately 50% of the children had at least one BMI measurement ≥95%tile and about 70% had at least one ≥85%tile. Using BMI_HA percentiles, obesity incidence decreased slightly in SW children (47% to 43%) and markedly in SV children (50% to 33%); however, overweight status was not reduced. Only 6% of SW and 1% of SV children were persistently obese (>3 clinic visits) when BMI_HA was applied whereas overweight status persisted in 35% of SW and 33% of SV children. Most obesity or overweight when using BMI_HA occurred before age 10 and there was no association with hydrocortisone or fludrocortisone dosing. Adiposity rebound for SW children occurred by 3.3 years and in SV females by age 3.8 years, over a year earlier than the adiposity rebound for healthy children.

Conclusion

Children with CAH are at higher risk for early onset obesity and overweight with or without using BMI_HA but rates of persistent obesity were lower than previously reported. Careful hydrocortisone dosing during early childhood is needed to prevent increased weight gain and an early adiposity rebound.

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