| Non-standardized coefficient | Standardized coefficient | t | p | 95% CI | VIF | |
B | Standard error | Beta | |||||
Constant | 3.722 | 3.203 | - | 1.162 | 0.048 | −2.556 - 10.000 | - |
pH 1 (<5.5) | −0.035 | 0.162 | −0.165 | −0.216 | 0.038 | −0.352 - 0.282 | 3.295 |
pH 2 (5.5 - 6.5) | −0.093 | 0.351 | −0.382 | −0.266 | 0.051 | −0.780 - 0.594 | 11.616 |
pH 3 (6.5 - 7.5) | 0.062 | 0.122 | 0.436 | 0.512 | 0.030 | −0.176 - 0.300 | 4.096 |
pH 4 (7.5 - 8.4) | 0.091 | 0.385 | 0.359 | 0.238 | 0.022 | −0.663 - 0.846 | 12.852 |