Table 1.
Prevalence of obstructive lung disorder by demographic characteristics
| Characteristics | N | Prevalence of obstructive lung function (95%CI)a | P-valueb |
|---|---|---|---|
| Smoking status | < 0.001 | ||
| Never-smokers | 2948 | 2.99 (2.14-4.16) | |
| Former smokers | 2306 | 9.55 (7.77-11.7) | |
| Active smokers | 1472 | 17.7 (15.2-20.6) | |
| Pack years of cigarettes | < 0.001 | ||
| 0 | 3171 | 3.08 (2.24-4.23) | |
| >0-19 | 1874 | 6.50 (5.05-8.33) | |
| ≥ 20 | 1681 | 19.6 (16.7-22.9) | |
| Zinc intake, mg/d | 0.01 | ||
| Tertile 1 (< 8.35) | 2464 | 11.4 (8.78-14.7) | |
| Tertile 2 (8.30-14.4) | 2135 | 8.66 (6.99-10.7) | |
| Tertile 3 (>14.4) | 2127 | 6.60 (5.39-8.07) | |
| Age, yrs | < 0.001 | ||
| 40-54 | 2484 | 5.97 (4.38-8.10) | |
| 55 or older | 4242 | 11.5 (10.2-12.9) | |
| Gender | 0.16 | ||
| Male | 3288 | 9.55 (8.06-11.3) | |
| Female | 3438 | 8.13 (6.62-9.94) | |
| Race/Ethnicity | < 0.001 | ||
| Mexican American | 1522 | 4.86 (3.70-6.37) | |
| Non-Hispanic black | 1500 | 5.58 (4.09-7.57) | |
| Non-Hispanic white | 3704 | 9.26 (7.93-10.8) | |
| Body mass index, kg/m2 | 0.001 | ||
| <18.5 | 106 | 33.9 (20.0-51.3) | |
| 18.5-24.9 | 2120 | 9.80 (7.66-12.5) | |
| 25-29 | 2634 | 7.96 (6.59-9.60) | |
| ≥ 30 | 1866 | 7.10 (5.87-8.57) |
a Obstructive lung disorder was defined as: observed FEV1/FVC ratio < [FEV1/FVC]LLN and observed FEV1 < [FEV1]LLN [20,21]. The estimated prevalence of obstructive lung disorder was calculated using the NHANES III sample weights.
b Cochran-Mantel-Haenszel chi-square test.
Abbreviations: FEV1, forced expiratory volume in 1 second; FVC, forced volume vital capacity; LLN, lower limit of normal.