TABLE 2.

Longitudinal Correlations Between the Initial and Final Levels of the BMI Metrics Among 15 428 Pairs of Examinations

		BMI Metric
		N	BMI	BMIz	BMIaz	%BMIp95
All children	Overall	14 147	0.86	0.89	0.89	0.88
	Obesitya	909	0.72	0.61	0.73	0.70
	Severe	247	0.64	0.46	0.65	0.61
<10 y	Overall	7448	0.83	0.87	0.87	0.87
	Obesity	466	0.69	0.58	0.72	0.70
	Severe	114	0.66	0.36	0.60	0.57
≥10 y	Overall	6699	0.89	0.90	0.91	0.91
	Obesity	443	0.70	0.64	0.73	0.72
	Severe	133	0.58	0.56	0.67	0.64

Values represent the correlation between consecutive levels of each BMI metric between ages 5 and 17.9 y. For children who were examined more than 2 times, each pair of adjacent examinations contributed to the analysis.

^aObesity is classified as a %BMIp95 ≥100. Of the 1156 children with obesity, 909 had moderate obesity (%BMIp95 of 100–119) and 247 had severe obesity (%BMIp95 ≥120).