Table 8.

Marginal effects of the variables used in the model on distance parameter.

	Marginal effects	t-statistics	95% confidence interval
Fairness of PPR vaccine prices
Pr(Distv = 0); independent variable = 1	0.076	0.000	0.043	0.109
Pr(Distv = 1); independent variable = 1	0.045	0.001	0.019	0.071
Pr(Distv = 2); independent variable = 1	0.144	0.000	0.102	0.186
Pr(Distv = 3); independent variable = 1	0.735	0.000	0.683	0.786
Benefit awareness
Pr(Distv = 0); independent variable = 1	0.127	0.000	0.093	0.162
Pr(Distv = 1); independent variable = 1	0.034	0.001	0.014	0.053
Pr(Distv = 2); independent variable = 1	0.131	0.000	0.093	0.168
Pr(Distv = 3); independent variable = 1	0.708	0.000	0.658	0.758
Production system
Pr(Distv = 0); independent variable = 2	0.167	0.000	0.126	0.208
Pr(Distv = 1); independent variable = 2	0.039	0.000	0.017	0.061
Pr(Distv = 2); independent variable = 2	0.143	0.000	0.102	0.184
Pr(Distv = 3); independent variable = 2	0.650	0.000	0.592	0.709
Some vaccines better than others
Pr(Distv = 0); independent variable = 2	0.155	0.000	0.109	0.202
Pr(Distv = 1); independent variable = 2	0.064	0.001	0.028	0.101
Pr(Distv = 2); independent variable = 2	0.172	0.000	0.117	0.226
Pr(Distv = 3); independent variable = 2	0.608	0.000	0.540	0.677