Measure	Severity*
	Mild	Moderate	Severe
Percent median BMI†	80% to 90%	70% to 79%	< 70%
BMI Z-score‡	−1 to −1.9	−2 to −2.9	−3 or greater
Weight loss	> 10% pre-illness weight	> 15% pre-illness weight	> 20% pre-illness weight in one year or > 10% pre-illness weight in six months