Table 2.
Effect of sequential adjustment for potential confounders on ethnic differences (Δ) (African-American–white) in spirometric values
| Variable | FEV1 Δ (l) (95% CI) | FVC Δ (l) (95% CI) | FEV1/FVC Δ (%) (95% CI) |
|---|---|---|---|
| Men | |||
| − | −0.46 (−0.51 to −0.40) | −0.73 (−0.80 to −0.66) | 2.1 (1.5 to 2.7) |
| + age, height | −0.49 (−0.53 to −0.44) | −0.75 (−0.80 to −0.70) | 1.8 (1.2 to 2.3) |
| + sitting height | −0.44 (−0.49 to −0.39) | −0.69 (−0.75 to −0.63) | 1.9 (1.2 to 2.5) |
| + waist–hip ratio, BMI | −0.51 (−0.57 to −0.46) | −0.73 (−0.80 to −0.67) | 1.0 (0.3 to 1.7) |
| + ever smoked, current smoker, pack-years | −0.48 (−0.54 to −0.43) | −0.71 (−0.77 to −0.65) | 1.2 (0.5 to 1.9) |
| + income, working status, most recent occupation, education | −0.45 (−0.50 to −0.39) | −0.68 (−0.75 to −0.61) | 1.5 (0.7 to 2.1) |
| Women | |||
| − | −0.27 (−0.30 to −0.23) | −0.44 (−0.49 to −0.40) | 2.5 (2.0 to 2.9) |
| + age, height | −0.33 (−0.36 to −0.30) | −0.53 (−0.56 to −0.49) | 2.4 (2.0 to 2.8) |
| + sitting height | −0.29 (−0.32 to −0.25) | −0.47 (−0.51 to −0.43) | 2.4 (1.9 to 2.8) |
| + waist–hip ratio, BMI | −0.29 (−0.32 to −0.25) | −0.43 (−0.46 to −0.39) | 1.3 (0.8 to 1.8) |
| + ever smoked, current smoker, pack-years | −0.27 (−0.30 to −0.24) | −0.41 (−0.45 to −0.37) | 1.5 (1.8 to 2.7) |
| + income, working status, most recent occupation, education | −0.26 (−0.30 to −0.22) | −0.41 (−0.45 to −0.36) | 1.7 (1.1 to 2.2) |
Δ, difference.