Study on the Relationship between Manganese Concentrations in Rural Drinking Water and Incidence and Mortality Caused by Cancer in Huai’an City

Table 1

The comparison of Mn concentrations in drinking water in Huai’an city.

Variable		Mean	Std.	()
Counties
Chuzhou county	57	401.15	309.76	2.92	0.06
Jinhu county	59	574.46	701.6
Xuyi county	42	350.17	352.26
Periods
High flow period	84	265.47	388.83	−5.34	0.00
Low flow period	74	664.41	544.82
Sources
Surface water	47	506.33	362.88	5.02	0.01
Shallow groundwater	55	573.64	672.47
Deep groundwater	56	287.83	370.25
All	158	452.32	507.76