Table 1.

Subtypes of gout* used in the present study

Subtype	Clinical parameters
Differentiated subtype
RUE type gout	FEUA <5.5% and UUE ≤25
ROL type gout	FEUA≥5.5% and UUE >25
Combined type gout	FEUA <5.5% and UUE >25
Normal type gout	FEUA≥5.5% and UUE ≤25
Broader subtype
RUE gout (RUE type gout +combined type gout)	FEUA <5.5%
ROL gout (ROL type gout +combined type gout)	UUE >25

*Subtypes of hyperuricaemia can be classified in the same manner.

FE_UA, fractional excretion of uric acid (unit: %); ROL, renal overload; RUE, renal underexcretion; UUE, urinary urate excretion (unit: mg/h/1.73 m²).