Table 6 Estimated coefficients (means and standard deviations) of the three models in the WTP space

Choice 1

27.01557

2.319

27.002

2.318

28.053

2.412

Choice 2

27.95799

5.593

27.478

6.646

32.251

6.914

Pressure

− 1.72804

1.319

− 1.758

1.340

− 1.518

1.229

Quantity

2.944709

1.324

2.924

1.340

2.720

1.273

Quality

5.479457

1.665

5.508

1.680

5.448

1.641

Interruption

− 1.66327

0.967

− 1.637

0.991

− 1.591

1.137

Dysentery

− 0.9824

0.954

− 0.957

0.975

− 0.929

1.078

Piped water

0.813201

1.092

0.815

1.098

1.563

1.297

Education

1.56327

0.963

1.537

0.989

1.581

1.137

Vendor

− 0.16659

0.077

− 0.432

0.019

− 0.997

1.000

Income

8.426616

0.045

8.551

0.024

9.071

1.640

Shortage

− 1.75488

0.095

− 0.172

0.005

− 2.883

2.746

Price

− 0.872

0.110

− 0.882

0.174

− 0.781

0.146