| Variables | Description of variables | Expected effects |
| SEX | Category variable representing the gender of the respondent | − |
| AGE | Age of respondent | + |
| SMAT | Categorial variable representing the marital status of the respondent | − |
| EDUC | Category variable representing the education level of the respondent | + |
| CHILD | Number of children in the household | + |
| INCOME | Variable representing the level of monthly household income | + |
| STATSAN | Variable representing the household health status | − |
| HOME | Category variable representing speed in the reception of Patients | + |
| ASSOCOM | Category variable representing membership in a rural community action association | + |
| PROPERTY | Categorical variable representing the ownership of the health center | + |
| DOCTOR | Category variable representing the regular presence of the doctor at the health center | + |
| MSPOMED | Category variable representing the availability of essential drugs in the Health Center | − |
| TRAD | Tradition of using the local health service | + |