Table 2.

Comparison of zBMI categories using CDC and WHO weight category definitions in pooled TARGet Kids! and BORN for children 17 to 24 months of age

WHO*†	Prevalence (95% CI)	CDC†	Prevalence (95% CI)
zBMI ≤ 1	75.4% (74.1–76.6)	< 85th percentile	74.1% (72.8–75.4)
1 < zBMI ≤ 2	18.4% (17.3–19.6)	85th to 95th percentile	13.7% (12.7–14.7)
2 < zBMI ≤ 3	5.1% (4.5–5.8)	95th to ≤ 120% of 95th percentile	11.9% (11.0–12.9)
zBMI > 3	1.1% (0.8–1.4)	>120% of 95th percentile	0.3% (0.2–0.6)

*Definitions of zBMI categories for children 5–19 years of age were applied since no definition of severe obesity currently exists for children <2 years of age

^†Detailed definitions for the weight categories and percentile ranges for individual TARGet Kids! and BORN can be found in Supplemental Table 1