Table 2.

Summary of the growth percentiles in natural history, symptomatic HSCT, and asymptomatic HSCT patients, indicating percentages below the third percentile for head circumference and below the fifth percentile for height, weight, and body mass index.

	Head circumference (<3rd percentile)	Height (<5th percentile)	Weight (<5th percentile)	BMI (<5th percentile)
Natural history	12%	56%	59%	4%
Symptomatic HSCT	11%	67%	56%	22%
Asymptomatic HSCT	17%	91%	96%	22%

Microcephaly was defined as head circumference below the third percentile and macrocephaly as head circumference above the 97th percentile, in accordance with the CDC.