Table 4

Cluster analysis of secondary outcomes (cascada) among parents of children aged 9-60 months (t-test of difference between 18 intervention and 14 control sites, cluster analysis as in Tables 2 and 3).

Intervention clusters

Control clusters

Outcome in primary (cluster) analysis (t-test)

GEE adjusting for baseline differences

Respondent could mention an illness preventable by mean 0.74

2368/3153

mean 0.74

1437/2431

mean 0.58

Difference 0.17, 95% 0.067-0.272

t = 3.369, 30 df p = 0.002

Difference 0.121

95% 0.055-0.189 (1)

Do you think it's worthwhile to vaccinate children? (attitude)

3006/3161

mean 0.95

2116/2475

mean 0.84

Difference 0.11, 95% 0.021-0.197

t = 2.543, 30 df p = 0.016

Difference 0.054

95% 0.013-0.105 (1)

Do your neighbours think it's worthwhile to vaccinate children? (subjective norm)

2842/3166

mean 0.89

1884/2475

mean 0.74

Difference 0.15, 95% 0.039-0.260

t = 2.755, 30 df p = 0.010

Difference 0.095

95% 0.011-0.182 (1)

How much time are you prepared to spend to take a child from your household to be vaccinated? Willing to take some time (intention)

2954/3088

mean 0.95

2037/2317

mean 0.84

Difference 0.11, 95% 0.002-0.227

t = 2.086, 30 df p = 0.046

Difference 0.073

95% 0.015-0.156 (2)

Mother included in decisions about vaccination (agency)

1834/3131

mean 0.59

1345/2434

mean 0.54

Difference 0.04, 95% -0.024-0.108

t = 1.299, 30 df p = 0.204

Difference 0.043

95% -0.009-0.097 (NS) (3)

Have you discussed vaccination for children in the family? (discussion)

1584/3155

mean 0.49

826/2459

mean 0.31

Difference 0.19, 95% 0.054-0.318

t = 2.868, 30 df p = 0.007

Difference 0.155

95% 0.032-0.270 (2)

Initial model: intervention, willingness to travel, access, knowledge of preventable disease.

(1) Final model: intervention, willingness to travel, access.

(2) Final model: intervention, knowledge of preventable disease.

(3) Final model: intervention, knowledge of preventable disease, access.

Andersson et al. BMC International Health and Human Rights 2009 9(Suppl 1):S8   doi:10.1186/1472-698X-9-S1-S8