Table 4 Logistic regression of the association between niacin intake and constipation

Crude model

 Continuous [log₁₀(niacin)]

0.849 (0.793, 0.909)

< 0.001

 Q2 (18–27 mg)

–

–

 Q1 (0–18 mg)

1.088 (1.046, 1.132)

< 0.001

 Q3 (27–39 mg)

0.984 (0.936, 1.036)

0.5

 Q4 (> 39 mg)

0.965 (0.910, 1.022)

0.2

Model 1

 Continuous [log₁₀(niacin)]

0.917 (0.854, 0.985)

0.023

 Q2 (18–27 mg)

–

–

 Q1 (0–18 mg)

1.059 (1.012, 1.106)

0.019

 Q3 (27–39 mg)

0.998 (0.949, 1.106)

> 0.9

 Q4 (> 39 mg)

0.997 (0.939, 1.058)

0.9

Model 2

 Continuous [log₁₀(niacin)]

0.871 (0.794, 0.955)

0.01

 Q2 (18–27 mg)

–

–

 Q1 (0–18 mg)

1.073 (1.025, 1.123)

0.013

 Q3 (27–39 mg)

0.990 (0.928, 1.056)

0.7

 Q4 (> 39 mg)

0.978 (0.904, 1.058)

0.5