TABLE 1.

Mean Levels of Various Characteristics According to Age Group and Examination

Year	n	Black, %	Age, y	BMI	BMI z Scorea	Height z Score	SBP, mm Hg	SBP z Score	DBP	DBP z Score	High Blood Pressure, %	High Fifth Sound, %
Boys
1974	1821	37	10.3 ± 3	17.5 ± 3	−0.08	−0.13	100 ± 10	−0.28	62 ± 8	0.15	5.8	0
1977	2087	35	11.6 ± 4	18.7 ± 4	0.04	−0.09	102 ± 11	−0.38	62 ± 10	−0.01	4.7	0.2
1979	1828	36	11.3 ± 4	18.6 ± 4	0.11	−0.10	104 ± 11	−0.17	63 ± 8	0.16	7.2	0.3
1982	1694	36	11.2 ± 4	18.7 ± 4	0.17	−0.05	104 ± 11	−0.16	63 ± 9	0.09	5.4	0.7
1985	1629	36	11.3 ± 4	19.0 ± 4	0.18	0.02	104 ± 11	−0.23	60 ± 9	−0.09	5.0	0.2
1988	1638	40	11.0 ± 3	19.1 ± 4	0.32	0	101 ± 11	−0.41	59 ± 10	−0.23	3.5	0.2
1993	1521	44	11.4 ± 3	20.0 ± 5	0.47	0.12	103 ± 10	−0.28	62 ± 9	−0.02	4.1	0.2
Girls
1974	1677	37	10.3 ± 3	17.8 ± 4	−0.04	−0.03	100 ± 10	−0.25	63 ± 8	0.17	8.1	0
1977	1969	36	11.5 ± 4	18.7 ± 4	0.04	−0.10	101 ± 11	−0.31	62 ± 10	0.04	7.3	0.2
1979	1747	37	11.1 ± 4	18.5 ± 4	0.09	−0.10	103 ± 11	−0.05	64 ± 9	0.24	10.0	0.5
1982	1698	38	11.1 ± 4	18.8 ± 4	0.14	−0.05	103 ± 11	−0.05	64 ± 9	0.26	10.8	1.4
1985	1623	38	11.5 ± 4	19.5 ± 5	0.24	0.05	103 ± 11	−0.14	63 ± 9	0.13	8.7	1.2
1988	1575	41	11.0 ± 4	19.6 ± 5	0.35	−0.01	100 ± 10	−0.32	60 ± 10	−0.15	5.0	0.4
1993	1584	45	11.4 ± 3	20.2 ± 5	0.42	0.12	102 ± 10	−0.26	62 ± 9	0.03	5.8	0.7

These SDs do not account for the within-person clustering of levels and therefore underestimate the variability.

^aEstimates of the SDs of BMI-for-age and other z scores were close to 1.0.