Table 1 Participant characteristics (year 0 of the CARDIA study)
Blacks | Whites | Total | P value | |
|---|---|---|---|---|
Number of participants | 2289 (50.6%) | 2237 (49.4%) | 4526 | |
Male | 1032 (49.4%) | 1057 (50.6%) | 2089 | 0.14 |
Female | 1257 (51.6%) | 1180 (48.4%) | 2437 | |
Mean age, years (SD) | 24.3 (3.8) | 25.5 (3.4) | 4526 | <0.0001 |
Current smoker | 782 (34.2%) | 611 (27.3%) | 1393 | <0.0001 |
Past smoker | 210 (9.2%) | 397 (17.8%) | 607 | |
Non-smoker | 1297 (56.7%) | 1229 (54.9%) | 2526 | |
Ever reported asthma | 493 (21.5%) | 427 (19.1%) | 920 | 0.04 |
BMI, kg/m2 (SD) | 25.48 (5.63) | 23.71 (4.05) | 4526 | <0.0001 |
FEV1 (liters) [2SD Range] | 3.28 [1.90-4.66] | 3.83 [2.30-5.36] | 4526 | <0.0001 |
% predicted FEV1 (SD) | 98.2 (12.7) | 97.6 (10.7) | 4526 | 0.06 |
FVC (liters) [2 SD Range] | 3.93 [2.21-5.66] | 4.68 [2.67-6.69] | 4526 | <0.0001 |
% predicted FVC (SD) | 101.0 (12.4) | 100 (10.6) | 4526 | 0.002 |
FEV1/FVC (%) | 83.72 | 82.36 | 4526 | <0.0001 |
Median household income (study year 5) | $25,000-34,999 | $35,000-49,999 | 3806 | <0.0001 |
Years of education (SD) | 13.03 (1.82) | 14.59 (2.38) | 4526 | <0.0001 |