Table 2.
Adjusted ORa and 95% CI of CKD by smoking categories and pack-years
| OR | 95% CI | |
|---|---|---|
| Estimation for daily smokers | ||
| Daily smokers with 10 pack-years | 0.87 | (0.71, 1.07) |
| Daily smokers with 20 pack-years | 1.03 | (0.85, 1.25) |
| Daily smokers with 40 pack-years | 1.43 | (1.09, 1.89) |
| Estimation for intermittent smokers | ||
| Intermittent smokers with 5 pack-years | 1.21 | (0.92, 1.58) |
| Intermittent smokers with 10 pack-years | 1.38 | (1.06, 1.81) |
| Intermittent smokers with 20 pack-years | 1.81 | (1.24, 2.65) |
| Estimation for past smokers | ||
| Past smokers with 5 pack-years | 1.17 | (0.98, 1.39) |
| Past smokers with 10 pack-years | 1.19 | (1.00, 1.42) |
| Past smokers with 20 pack-years | 1.23 | (0.96, 1.57) |
aOR of CKD associated with smoking (daily, intermittent and past) compared with never smokers by pack-years of smoking based on models adjusted for age, sex, cross-classification of center and Hispanics/Latino background, body mass index, history of diabetes, history of prevalent coronary heart disease, systolic blood pressure, history of alcohol intake, high- and low-density lipoprotein cholesterols, hypertension and blood pressure lowering medications including angiotensin-converting enzyme inhibitors and angiotensin II receptor blockers. P-value for interaction of smoking categories with pack-years = 0.0003.