Table 6 Influence of change in behavioral determinants from baseline to follow-up on use of exclusive use of arsenic-safe water at follow-up

How high or low are the chances of you getting health problems from arsenic if it is in your well water?

Perceived vulnerability

1.21

0.33, 4.49

0.773

3.10

0.97, 9.85

0.055

2.04

0.42, 9.92

0.375

How high or low are the chances of someone in your household getting health problems from arsenic if it is in your well water?

Perceived vulnerability

1.57

0.43, 5.73

0.495

3.42

1.04, 11.33

0.044

2.16

0.43, 10.89

0.352

How high or low are the chances of you getting health problems from arsenic if you drink water from an arsenic filter?

Perceived vulnerability

0.91

0.22, 3.72

0.895

1.03

0.32, 3.28

0.967

0.62

0.13, 2.87

0.540

I have been drinking this water for a long time with no health problems, so I am not concerned about arsenic in my well water.

Perceived vulnerability

0.19

0.03, 1.15

0.071

1.21

0.32, 4.57

0.776

0.75

0.19, 2.92

0.683

Because no one in my house has developed health problems from arsenic, I am not concerned about arsenic in my well water.

Perceived vulnerability

1.04

0.25, 4.36

0.96

1.63

0.63, 4.27

0.317

1.01

0.35, 2.94

0.979

I can afford to fix my arsenic filter if it breaks.

Perceived cost

1.35

0.45, 4.00

0.592

0.97

0.32, 2.90

0.950

1.34

0.45, 3.96

0.595

Of all the things I have to worry about, the arsenic filter is not at the top of my list.

Competing Priorities

1.46

0.63, 3.43

0.379

1.22

0.57, 2.59

0.605

1.50

0.63, 3.56

0.355

If given the choice, I would prefer bottled water over water from an arsenic filter.

User preferences

0.95

0.30, 2.97

0.926

1.08

0.51, 2.30

0.838

1.04

0.42, 2.58

0.934

The tribal water system in my area has a safe level of arsenic.

Perceived safety of tribal water system

0.96

0.29, 3.14

0.940

1.96

0.87, 4.40

0.102

1.88

0.78, 4.52

0.157

How many people in your community have arsenic in their wells?

Perceived extent of contamination in community

1.43

0.32, 6.26

0.638

2.35

0.79, 7.03

0.126

2.54

0.78, 8.21

0.120

How many people in your community with arsenic in their wells drink this water without filtration?

Descriptive norm

3.42

0.85, 13.74

0.083

1.89

0.51, 6.94

0.34

How many people in your community with arsenic in their wells cook with this water without filtration?

Descriptive norm

2.56

0.49, 13.46

0.266

1.98

0.62, 6.29

0.248

How many people in your community with arsenic in their wells use bottled water for drinking?

Descriptive norm

1.96

0.34, 11.28

0.449

2.13

0.37, 12.26

0.398

How many people in your community with arsenic in their wells use an arsenic filter for their drinking water?

Descriptive norm

1.31

0.30, 5.61

0.720

1.98

0.45, 8.61

0.364

How many people in your community with arsenic in their wells use an arsenic filter for their cooking water?

Descriptive norm

2.65

0.53, 13.25

0.236

1.97

0.58, 6.71

0.277

How much would people who are important to you approve or disapprove of you using water containing high arsenic for drinking?

Injunctive norm

1.39

0.29, 6.63

0.683

2.08

0.43, 9.94

0.361

How much would people who are important to you approve or disapprove of you using water containing high arsenic for cooking?

Injunctive norm

3.34

0.74, 15.11

0.117

1.86

0.37, 9.31

0.448

How sure are you that you can get drinking water with a safe level of arsenic?

Self-efficacy

2.23

0.85, 5.83

0.103

2.83

0.91, 8.82

0.073

How sure are you that you can get water for cooking with a safe level of arsenic?

Self-efficacy

2.18

0.79, 5.98

0.132

2.25

0.87, 5.79

0.094

How sure are you that you could find local resources to learn about arsenic in water?

Self-efficacy

0.53

0.16, 1.73

0.289

0.46

0.14, 1.48

0.191

0.58

0.17, 2.00

0.386

How sure are you that local resources would help you resolve an arsenic-related problem with your private well?

Self-efficacy

0.67

0.24, 1.88

0.450

1.31

0.52, 3.31

0.575

1.07

0.39, 2.94

0.888

How sure are you that you can use your arsenic filter faucet every time you need water for drinking in your home?

Self-efficacy

1.47

0.28, 7.79

0.648

3.42

0.47, 24.86

0.224

How sure are you that you can use your arsenic filter faucet every time you need water for cooking in your home?

Self-efficacy

11.45

1.41, 92.79

0.022

3.08

0.47, 20.08

0.239

How sure are you that you will be able to buy a new arsenic filter cartridge when needed?

Self-efficacy

2.96

0.58, 15.03

0.191

1.94

0.51, 7.39

0.331

3.35

0.85, 13.27

0.085

How sure are you that you yourself can change your arsenic filter cartridge when needed?

Self-efficacy

0.95

0.41, 2.21

0.910

1.01

0.33, 3.03

0.991

0.92

0.30, 2.84

0.889

How sure are you that you will be able to use your arsenic filter consistently over the next year?

Self-efficacy

6.97

0.73, 66.98

0.092

1.81

0.47, 6.98

0.391

3.09

0.71, 13.43

0.133

How sure are you that you will be able to use your filter consistently over the next five years?

Self-efficacy

2.62

0.53, 12.87

0.236

2.38

0.59, 9.64

0.225

2.91

0.70, 12.07

0.142

How committed do you feel to drinking water only from your arsenic filter faucet?

Commitment strength

1.13

0.23, 5.49

0.876

1.56

0.30, 8.21

0.597

How committed do you feel to cooking with water only from your arsenic filter faucet?

Commitment strength

8.89

1.84, 43.06

0.007

4.24

1.15, 15.66

0.030

Arsenic knowledge

Knowledge

0.95

0.19, 4.81

0.949

0.50

0.10, 2.55

0.403

0.53

0.10, 2.82

0.460

Name two health conditions that can happen from arsenic exposure.

Knowledge

1.05

0.38, 2.88

0.920

1.35

0.61, 2.98

0.454

0.83

0.37, 1.87

0.662

Name two tasks where it is OK to use water with high arsenic.

Knowledge

1.32

0.56, 3.10

0.524

0.56

0.24, 1.30

0.174

0.68

0.29, 1.61

0.380

Name two tasks where it is NOT OK to use water with high arsenic.

Knowledge

0.70

0.23, 2.16

0.535

0.59

0.20, 1.74

0.338

0.76

0.27, 2.12

0.602

How could you remove arsenic from drinking water.

Knowledge

0.51

0.20, 1.33

0.170

1.39

0.50, 3.87

0.526

1.38

0.49, 3.91

0.539