Table 6.

Percentage of manganese serum levels below potentially differing critical levels

	Intermountain	Northern foothills	Central	Southern	Statewide
Critical level (ng/mL)	% below potential critical level
6	96	90	92	97	92
5	94	85	86	97	88
3.5	81	69	76	95	77
2.5	40	42	58	74	52