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. Author manuscript; available in PMC: 2010 Apr 13.

Published in final edited form as: J Rheumatol. 2008 May 1;35(9):1853–1858.

Panel A was calculated by a logistic regression model with the lowest intake category (<90 mg/d) as the reference group; Panel B was fitted by a cubic Spline logistic model with 90 mg/d as the reference group and the 95% confidence intervals are indicated by the dashed lines. Both models were adjusted for age (y), smoking status (never smoker, past smoker, or current smoker: 1–14 or ≥ 15 cigarettes/d), BMI (<23, 23–24.9, 25–26.9, 27–28.9, or ≥29 kg/m²), ethnicity (Caucasian vs. others), systolic blood pressure (<105, 105–114, 115–124, or ≥125 mm Hg), presence of gout (yes/no), use of aspirin (yes/no), total energy (kcal/d), dairy protein (g/d), fructose (g/d), alcohol (0, <5, 5–9, 10–14, 15–29, 30–49, or ≥ 50 g/d), and coffee (0, <1, 1–3, 4–5, or ≥ 6 cups/d).

Panel A was calculated by a logistic regression model with the lowest intake category (<90 mg/d) as the reference group; Panel B was fitted by a cubic Spline logistic model with 90 mg/d as the reference group and the 95% confidence intervals are indicated by the dashed lines. Both models were adjusted for age (y), smoking status (never smoker, past smoker, or current smoker: 1–14 or ≥ 15 cigarettes/d), BMI (<23, 23–24.9, 25–26.9, 27–28.9, or ≥29 kg/m²), ethnicity (Caucasian vs. others), systolic blood pressure (<105, 105–114, 115–124, or ≥125 mm Hg), presence of gout (yes/no), use of aspirin (yes/no), total energy (kcal/d), dairy protein (g/d), fructose (g/d), alcohol (0, <5, 5–9, 10–14, 15–29, 30–49, or ≥ 50 g/d), and coffee (0, <1, 1–3, 4–5, or ≥ 6 cups/d).

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