Table 1. Cut-off values of U-β₂M and U-NAG for subjects in county A (CA) and county B (CB).

Variable		Region	Cut-off value
			N	84th percentile	90th percentile
U-β2M (µg/g cr)		CA	130	1065.95	1541.33
		CB	116	1045.96	1268.95
U-NAG (U/g cr)		CA	130	5.67	6.42
		CB	116	40.90	53.38

U-β2M, urinary level of β2-microglobulin; U-NAG, urinary level of N-acetyl-β-D-glucosaminidase