Table V.

Screening characteristics of BMI and SF sum for elevated and low levels of PBF_DXA

			Children with elevated PBFDXA				Thin children (Low PBFDXA)
Sex	Race-ethnicity	Measure	Prevalence	Positive predictive value	Positive likelihood ratio	Kappa statistic	Prevalence	Positive predictive value	Positive likelihood ratio	Kappa statistic
Boys	Overall	BMI	0.18†	0.75	14.3	0.70†	0.17	0.41	3.3	0.28§
		SF sum	0.18	0.79	18.0	0.75†	0.17	0.61	7.7	0.53§
Girls	Overall	BMI	0.17	0.76	15.3	0.71	0.14	0.48	5.7	0.40§
		SF sum	0.17	0.77	15.7	0.71	0.14	0.62	10.0	0.55§
Boys	Non-Hispanic Whites	BMI	0.16	0.77	16.8	0.71	0.16	0.37	3.6	0.29§
		SF sum	0.16	0.80	12.0	0.76	0.17	0.54	7.1	0.51§
	Non-Hispanic Blacks	BMI	0.19	0.65	11.0	0.68‡	0.17	0.71	4.4	0.29§
		SF sum	0.17	0.75	17.4	0.77‡	0.24	0.86	11.2	0.56§
	Mexican-Americans	BMI	0.24	0.82	12.7	0.72	0.16	0.28	3.7	0.26§
		SF sum	0.23	0.85	16.5	0.73	0.13	0.50	9.5	0.52§§
Girls	Non-Hispanic Whites	BMI	0.16	0.80	19.9	0.73	0.15	0.47	5.6	0.41‡
		SF sum	0.16	0.79	18.2	0.73	0.15	0.59	9.0	0.55‡
	Non-Hispanic Blacks	BMI	0.26	0.61	7.5	0.66	0.10	0.67	7.6	0.34§
		SF sum	0.24	0.64	8.9	0.69	0.13	0.81	16.0	0.56§
	Mexican Americans	BMI	0.17	0.81	17.8	0.70	0.13	0.28	4.8	0.29§
		SF sum	0.16	0.87	27.3	0.73	0.12	0.45	9.8	0.51§

*Values represent various screening characteristics of BMI or the SF sum in the identification of children with elevated levels of PBF_DXA (left side) or low levels of PBF_DXA (right side). For example, a cross-classification of elevated levels of BMI and PBF_DXA among boys (first row, top left) indicated that the positive predictive value of an elevated BMI was 0.75 with a kappa statistic of 0.70.

P-values are based on the differences between kappa statistics for BMI and the SF sum, and were calculated for each imputation using jackknife replicate weights:

^†P < .05;

^‡P < .01;

^§P < .001.