Table 1.
Mean Levels of Study Variables by Race and Sex, Bogalusa Heart Study, Bogalusa, Louisiana, 1973–2010
| Characteristic | Whites, mean (SD) |
Blacks, mean (SD) |
Racial Differencea |
|||
|---|---|---|---|---|---|---|
| Men (n = 440) | Women (n = 499) | Men (n = 217) | Women (n = 298) | Men | Women | |
| Gestational age, weeks | 39.7 (1.7) | 39.7 (1.8) | 39.3 (2.7) | 39.5 (2.0) | 0.064 | 0.262 |
| Birth weight, kg | 3.47 (0.54) | 3.32 (0.53)** | 3.08 (0.61) | 3.04 (0.50) | <0.001 | <0.001 |
| Childhood (first examination) | ||||||
| Age, years | 9.8 (3.1) | 9.7 (3.2) | 9.4 (2.8) | 9.2 (2.8) | 0.130 | 0.038 |
| SBP, mm Hg | 99.9 (9.8) | 99.0 (9.7) | 98.6 (10.8) | 97.3 (9.9)* | 0.966 | 0.391 |
| DBP, mm Hg | 61.3 (8.0) | 61.5 (8.6) | 61.6 (7.9) | 60.3 (8.0)* | 0.099 | 0.995 |
| Adulthood (last examination) | ||||||
| Age, years | 36.5 (8.5) | 36.8 (8.2) | 31.8 (9.5) | 33.3 (8.7) | <0.001 | <0.001 |
| SBP, mm Hg | 117.8 (11.5) | 110.8 (12.0)** | 120.9 (15.5) | 115.3 (14.6)** | <0.001 | <0.001 |
| DBP, mm Hg | 80.0 (9.5) | 75.0 (8.7)** | 79.0 (12.9) | 75.7 (10.7)** | 0.093 | 0.003 |
| AUC measures, mm Hg | ||||||
| Total AUC of SBP | 112.1 (6.9) | 106.9 (6.3)** | 112.7 (8.1) | 109.0 (6.5)** | 0.002 | <0.001 |
| Total AUC of DBP | 71.3 (5.7) | 69.4 (4.7)** | 70.1 (6.3) | 69.7 (5.0)* | 0.365 | <0.001 |
| Incremental AUC of SBP | 12.0 (5.2) | 7.8 (5.0)** | 14.7 (6.5) | 11.6 (5.6)** | <0.001 | <0.001 |
| Incremental AUC of DBP | 10.7 (3.7) | 8.4 (3.6)** | 9.9 (4.5) | 9.3 (3.8)* | 0.387 | 0.056 |
| Variability, mm Hg | ||||||
| SD of SBP | 9.1 (3.4) | 7.7 (3.0)** | 11.1 (4.4) | 9.4 (4.2)** | <0.001 | <0.001 |
| SD of DBP | 9.0 (3.2) | 7.5 (2.7)** | 9.4 (4.0) | 8.5 (3.2)** | 0.060 | <0.001 |
| DEV of SBP | 5.0 (1.6) | 4.6 (1.4)** | 5.9 (1.7) | 5.3 (1.7)** | <0.001 | <0.001 |
| DEV of DBP | 4.5 (1.4) | 4.5 (1.4) | 4.8 (1.5) | 4.9 (1.5) | 0.194 | 0.007 |
| CV of SBP | 0.08 (0.03) | 0.07 (0.03)** | 0.10 (0.04) | 0.09 (0.04)** | <0.001 | <0.001 |
| CV of DBP | 0.13 (0.05) | 0.11 (0.04)** | 0.14 (0.06) | 0.12 (0.05)** | 0.190 | 0.005 |
Abbreviations: AUC, area under the curve; CV, coefficient of variation; DBP, diastolic blood pressure; DEV, deviation from age-predicted values; SBP, systolic blood pressure; SD, standard deviation.
* P < 0.05; **P < 0.01 for sex differences within racial groups.
a The mean levels were compared between race and sex groups, adjusted for age except age itself using analysis of covariance; gestational age and average age were used for birth weight and long-term measures (AUC and variability), respectively.