Table 1.
Descriptive statistics for demographic, predictor, and outcome variables for baseline year and years 2, 4, 6, 8, and 10 of the National Heart, Lung, and Blood Institute Growth and Health Study
| Variable | Baseline—age 10 | Year 2—age 11 | Year 4—age 13 | |||
|---|---|---|---|---|---|---|
| Black | White | Black | White | Black | White | |
| N | 1,213 | 1,166 | 1,201 | 1,158 | 1,120 | 1,026 |
| Income (%) | ||||||
| Less than $5,000 | 27.9 | 7.8 | ||||
| $5,000–$20,000 | 19.2 | 9.5 | ||||
| $2,0000–$40,000 | 29.5 | 32.4 | ||||
| $40,000 or more | 23.3 | 50.3 | ||||
| Education (%) | ||||||
| Less than high school | 31.5 | 20.2 | ||||
| 1–3 years post-high school | 47.4 | 30.2 | ||||
| 4-year college degree or more | 21.1 | 49.7 | ||||
| Perceived stress | ||||||
| Mean (standard deviation) | 25.0a (6.7) | 25.0a (7.2) | 23.9a (6.9) | 24.4a (7.2) | ||
| Range | 0–49 | 0–51 | 2–51 | 3–51 | ||
| Weight (kg) | ||||||
| Mean (standard deviation) | 39.6a (11.2) | 34.3b (8.6) | 46.2a (13.0) | 40.5b (10.4) | 57.9a (15.0) | 52.0b (12.2) |
| Range | 20.3–81.1 | 19.9–75.1 | 23.0–93.1 | 22.3–80.7 | 29.9–112.3 | 27.4–100.3 |
| Height (cm) | ||||||
| Mean (standard deviation) | 142.9a (7.9) | 139.6b (7.1) | 149.5a (8.1) | 145.9b (7.6) | 159.5a (6.6) | 158.0b (7.1) |
| Range | 121.3–169.0 | 117.2–163.3 | 126.6–171.6 | 123.2–169.5 | 138.7–179.1 | 135.1–177.1 |
| BMI | ||||||
| Mean (standard deviation) | 19.2a (4.2) | 17.9b (3.3) | 20.5a (4.7) | 18.8b (3.6) | 22.7a (5.4) | 20.7b (4.1) |
| Range | 12.4–35.2 | 11.2–34.4 | 12.4–39.5 | 12.4–36.5 | 13.7–42.6 | 13.1–39.7 |
| Variable | Year 6—age 15 | Year 8—age 17 | Year 10—age 19 | |||
| Black | White | Black | White | Black | White | |
| N | 975 | 834 | 972 | 914 | 985 | 958 |
| Income (%) | ||||||
| Less than $5,000 | ||||||
| $5,000–$20,000 | ||||||
| $2,0000–$40,000 | ||||||
| $40,000 or more | ||||||
| Education (%) | ||||||
| Less than high school | ||||||
| 1 −3 years post-high school | ||||||
| 4-year college degree or more | ||||||
| Perceived stress | ||||||
| Mean (standard deviation) | 23.6a (7.3) | 24.2a (8.2) | 23.7a (7.7) | 25.3b (8.3) | 22.7a (7.5) | 23.0a (8.5) |
| Range | 0–55 | 2–53 | 2–54 | 4–52 | 0–55 | 3–55 |
| Weight (kg) | ||||||
| Mean (standard deviation) | 64.5a (17.0) | 59.5b (12.3) | 69.0a (19.4) | 62.7b (13.5) | 72.7a (21.1) | 65.6b (15.2) |
| Range | 32.3–120.8 | 33.0–108.9 | 32.4–134.5 | 39.5–125.1 | 39.4–151.2 | 40.0–123.2 |
| Height (cm) | ||||||
| Mean (standard deviation) | 162.4a (6.2) | 163.5b (6.1) | 163.1a (6.3) | 164.7b (6.3) | 163.8a (6.2) | 165.3b (6.2) |
| Range | 142.7–179.3 | 143.5–180.3 | 143.1–181.5 | 144.0–182.9 | 146.6–183.6 | 143.7–182.4 |
| BMI | ||||||
| Mean (standard deviation) | 24.4a (6.1) | 22.2b (4.2) | 25.9a (6.9) | 23.1b (4.6) | 27.1a (7.5) | 24.0b (5.4) |
| Range | 15.1–46.6 | 13.6–42.0 | 15.4–51.2 | 15.4–47.2 | 15.8–55.6 | 15.9–47.5 |
Within each study timepoint, different letters indicate Black and White girls differed significantly at p<0.001