Association between Glycosylated Hemoglobin and Serum Uric Acid: A US NHANES 2011–2020

Table 6

Threshold effect analysis of HbA1c on SUA in BMI ≥30 kg/m² using the two-piecewise linear regression model.

Serum uric acid	Adjusted β (95% CI), value
BMI ≥30 kg/m^2
Model 1: fitting model by standard linear regression	−7.02 (−9.28, −4.76) <0.0001
Model 2: fitting model by two-piecewise linear regression
Inflection point	6.3%
Glycosylated hemoglobin <6.3 (%)	15.19 (7.45, 22.92) 0.0001
Glycosylated hemoglobin >6.3 (%)	−12.50 (−15.39, −9.60) <0.0001
for the log-likelihood ratio test	<0.001

Age, sex, race, education level, the ratio of family income to poverty, energy intake, protein intake, carbohydrate intake, dietary fiber intake, total fat intake, LDL-C, HDL-C, TG, TCHO, urine albumin, urine creatinine, urine albumin creatinine ratio, SBP, DBP, heavy alcohol consumption, smoking status, and minutes sedentary activity were adjusted.