Table 3.

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

SUA	Adjusted β (95% CI)	P values
Male
Model 1: fitting model by standard linear regression	8.16 (3.10, 13.23)	0.0016
Model 2: fitting model by two-piecewise linear regression
Inflection point		11.5
WWI <11.5(cm/√kg)	11.41 (5.62, 17.20)	0.0001
WWI >11.5(cm/√kg)	−5.09 (−17.63, 7.45)	0.4261
P for the log-likelihood ratio test		0.023

Age, race, 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.