Table 2.
ORs and 95% CIs for COPD according quartile of niacin intake.
| Variables | OR (95%CI) | |||||
|---|---|---|---|---|---|---|
| Model 1 | P-value | Model 2 | P-value | Model 3 | P-value | |
| Niacin intake (mg/day) | ||||||
| Q1 (1.771, 16.074) | 1 (ref) | 1 (ref) | 1 (ref) | |||
| Q2 (16.075, 21.895) | 0.82 (0.53, 1.28) | 0.371 | 0.82 (0.53, 1.29) | 0.377 | 0.81 (0.50, 1.316) | 0.354 |
| Q3 (21.896, 29.387) | 0.64 (0.42, 0.96) | 0.034 | 0.70 (0.46, 1.06) | 0.091 | 0.66 (0.42, 1.04) | 0.067 |
| Q4 (29.388, 122.087) | 0.41 (0.28, 0.60) | < 0.001 | 0.56 (0.37, 0.85) | 0.008 | 0.55 (0.33, 0.89) | 0.021 |
| P for trend | < 0.0001 | 0.004 | 0.009 | |||
OR, odds ratio; CI, confidence interval; Q, quartile. Model 1 is unadjusted. Model 2 adjusted for age. Model 3 adjusted for age, race, annual family income, smoking status, hypertension, diabetes, marital status, drinking status. The lowest quartile of dietary niacin intake was used as the reference group.