Table 2 ORs and 95% CIs for COPD according quartile of niacin intake.

From: Association of dietary niacin intake with the prevalence and incidence of chronic obstructive pulmonary disease

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

 
  1. 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.
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