Water body | Comparison | t | df | p-value | p-value corrected |
Namakan Reservoir | 1952-1970 vs 1970-2000 | 1.769 | 31.081 | 0.087 | 0.260 |
| 1952-1970 vs 2000-2012 | −0.345 | 29.955 | 0.732 | 1.000 |
| 1970-2000 vs 2000-2012 | −2.410 | 28.538 | 0.023 | 0.068 |
Rainy Lake | 1952-1970 vs 1970-2000 | −1.366 | 28.574 | 0.183 | 0.548 |
| 1952-1970 vs 2000-2012 | 1.018 | 21.094 | 0.320 | 0.961 |
| 1970-2000 vs 2000-2012 | 1.965 | 15.931 | 0.057 | 0.201 |