| Hypothesis | Description | Statistic importance (p-value) | Result |
| Η1 | The Successful Integration of the Lean Management principles/systems positively affects the Business Market Performance. | 0.00 < 0.01 | Confirmed |
| Η2 | The Successful Integration of the Lean Management principles/systems positively influences the Environmental Performance of a Public Utility Company | 0.00 < 0.01 | Confirmed |
| Η3 | The Successful Integration of the Lean Management principles/systems positively affects the Financial Performance of a Public Utility Company. | 0.00 < 0.01 | Confirmed |