title: [Drug expenditure in primary care: associated variables and allocation of drug budgets according to health district].
abstract: OBJECTIVE
  Identify factors explaining variability in prescribing costs after reviewing ecological data related to costs and socio-demographic characteristics of the health care zones in the autonomous region of Valencia, and explore the usefulness of using the model to set prescribing budgets in basic healthcare zones.
  
  
  METHODS
  An ecological analysis of the value socio-demographic characteristics and use of healthcare services to explain prescribing costs in 1997. Development of a prediction model based on multiple linear regression in data for prescribing costs in 1997 and validation in data for 1998.
  
  
  RESULTS
  Factors that correlated positively with prescribing costs were the percentage of inhabitants over the age of 80, the death rate, the percentage of inhabitants with only primary education or less, the percentage of inhabitants between the ages of 65 and 79 and the distance from the capital city. A multivariate model including the death rate, the percentage of inhabitants 80 years of age and older, the number of cars per 100 inhabitants and number of visits per inhabitant accounted for 44.5% of the variations in prescribing costs in 1997 and 32% in 1998.
  
  
  CONCLUSIONS
  Socio-demographic factors and certain variables associated with health care utilization can be applied, within certain limitations, to set prescribing budgets in basic healthcare zones.
authors.affiliation: Escuela Valenciana de Estudios para la Salud (EVES).
authors.forename: A
authors.initials: A
authors.lastname: García-Sempere
authors.forename: S
authors.initials: S
authors.lastname: Peiró
mesh_terms: D002017:Budgets / Q000706:statistics & numerical data*; D002391:Catchment Area, Health; D016527:Drug Costs / Q000706:statistics & numerical data*; D006801:Humans; D011320:Primary Health Care / Q000191:economics*; D013030:Spain