TABLE 1.
Sample Characteristics and Unadjusted Primary Results by Survey Year
| NHANES | 1976–1980 | 1988–1994 | 1999–2000 | 2001–2002 | 2003–2004 | 2005–2006 | 2007–2008 |
|---|---|---|---|---|---|---|---|
| N examined | 1368 | 3342 | 2014 | 2147 | 1710 | 1719 | 1201 |
| N excluded | 1716 | 514 | 286 | 291 | 422 | 447 | 338 |
| Age (Years) | 12.7±2.8 | 12.4±2.9 | 13.2±2.7 | 13.1±2.7 | 13.46± 2.61 | 13.23±2.68 | 12.56±2.84 |
| Girls | 638 (46.6%) | 1728 (51.7%) | 1003 (49.8%) | 1102 (51.3%) | 860 (50.3%) | 891 (51.8%) | 615 (49.1%) |
| Non-Hispanic White | 940 (68.9%) | 902 (27.0%) | 408 (20.3%) | 666 (31.0%) | 447 (26.1%) | 463 (26.9%) | 393 (31.4%) |
| Non-Hispanic Black | 202 (14.8%) | 1161 (34.7%) | 592 (29.4%) | 660 (30.7%) | 605 (35.4%) | 556 (32.3%) | 293 (23.4%) |
| Mexican American | 71 (5.2%) | 1115 (33.4%) | 858 (42.6%) | 639 (29.8%) | 538 (31.5%) | 561 (32.6%) | 341 (27.2%) |
| Height (centimeters) | 154.9±15.7 | 153.7±14.8 | 157.9±14.0 | 157.9±14.2 | 159.9±13.49 | 158.4±14.16 | 155.2±14.97 |
| Weight (kilograms) | 48.61±16.04 | 50.73±18.05 | 57.44±20.33 | 56.27±19.42 | 58.94±19.33 | 57.89±20.59 | 54.83±20.15 |
| BMI (kilograms per meter squared) | 19.68±3.76 | 20.89±4.89 | 22.51±5.73 | 22.04±5.47 | 22.62±5.45 | 22.56±5.85 | 22.14±5.56 |
| BMI > 95th percentile | 72 (5.3%) | 472 (14.3%) | 434 (21.6%) | 400 (18.8%) | 333 (19.6%) | 386 (22.5%) | 304 (24.4%) |
| Heart rate per minute | 82±13 | 77±12 | 77±12 | 78±12 | 78±12 | 79±13 | 79±13 |
| Daily Sodium Intake (milligrams) | 2922±1598 | 3524±1998 | 3274±1790 | 3350±1818 | 3348±1726 | 3376±1846 | 3221±1746 |
| Lead (micrograms per deciliter) | 12.20±4.48 | 2.90±2.80 | 1.59±1.19 | 1.36±1.16 | 1.37±1.31 | 1.16± 1.10 | 1.05±0.72 |
| Lead > 10 micrograms per deciliter | 822 (60.1%) | 85 (2.5%) | 4 (0.2%) | 4 (0.2%) | 2 (0.1%) | 3 (0.2%) | --- |
| PP (millimeters mercury) | 39.3±11.6 | 46.5±12.0 | 45.7±12.5 | 46.7±13.2 | 48.9±12.9 | 49.6±12.9 | 48.7±12.5 |
| MAP (millimeters mercury) | 82.3±10.1 | 73.4±8.9 | 77.3±8.1 | 75.7±8.0 | 74.9±7.8 | 75.3±8.2 | 74.4±8.3 |
| Systolic BP (millimeters mercury) | 108.6±13.7 | 104.4±10.3 | 107.8±10.3 | 106.8±10.3 | 107.5±9.8 | 108.4±10.2 | 106.8±10.1 |
| Diastolic BP (millimeters mercury) | 69.2±10.2 | 57.9±10.7 | 62.1±9.9 | 60.1±10.0 | 58.6±10.0 | 58.8±10.1 | 58.1±10.2 |
| Elevated BP | 82 (6.0%) | 38 (1.1%) | 24 (1.2%) | 23 (1.1%) | 14 (0.8%) | 30 (1.7%) | 21 (1.8%) |
All measurements given as Mean ± standard deviation or count and proportion of total as appropriate. Abbreviations: N-sample population number; SD standard deviation; cm- centimeter; kg- kilogram; m2-meter squared; BMI-body mass index; min-1- per minute; mcg- micrograms; dL- deciliter; PP- pulse pressure; MAP- mean arterial pressure; BP- blood pressure