Research Article
Study on the Relationship between Manganese Concentrations in Rural Drinking Water and Incidence and Mortality Caused by Cancer in Huai’an City
Table 2
The comparison of Mn concentrations in drinking water during different periods.
| Periods | Water sources | | Mean | Std. | | |
| High flow period | Surface water | 28 | 437.85 | 439.79 | 7.19 | 0.00 | Shallow groundwater | 28 | 286.56 | 429.09 | Deep groundwater | 28 | 72.01 | 130.91 | All | 84 | 265.47 | 388.83 |
| Low flow period | Surface water | 19 | 607.24 | 168.38 | 3.50 | 0.04 | Shallow groundwater | 27 | 871.35 | 753.13 | Deep groundwater | 28 | 503.65 | 406.83 | All | 74 | 664.41 | 544.82 |
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