Table 4.

Threshold effect analysis of WWI on SUA in non-Hispanic White using the two-piecewise linear regression model.

SUA	Adjusted β (95% CI)	P values
Non-Hispanic White
Model 1: fitting model by standard linear regression	2.21 (−2.44, 6.87)	0.3508
Model 2: fitting model by two-piecewise linear regression
Inflection point		11.08
WWI <11.08(cm/√kg)	−7.08 (−14.39, 0.23)	0.0576
WWI >11.08(cm/√kg)	10.73 (3.78, 17.68)	0.0025
P for the log-likelihood ratio test		0.001

Age, sex, education level, the ratio of family income to poverty, BMI, 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, HbA1c, SBP, DBP, heavy alcohol consumption, smoking status, and minutes sedentary activity were adjusted.