From: Household demand and supply for clean groundwater in the Mekong Delta, Vietnam
 | Variable | Coefficient | t -value | R 2 |
---|---|---|---|---|
Constant | Â | 0.51 | 7.321*** | Â |
 Manager education |  |  |  |  |
 | High school and above | - | - |  |
Secondary | 0.135 | 2.654*** | Â | |
Primary | 0.133 | 1.186 | Â | |
 Years GSU established |  |  |  |  |
 | Prior to 2001 | - | - |  |
2002 to 2004 | −0.033 | −0.354 |  | |
2005 to 2006 | −0.135 | −1.968** |  | |
 Capacity |  |  |  |  |
 | More than 150 households | - | - |  |
Less than 150 households | 0.076 | 0.909 | Â | |
 Distance |  |  |  |  |
 | More than 3 km | - | - |  |
Less than 3Â km | 0.033 | 0.384 | Â | |
 | 0.265 |