ObjectiveTo identify the characteristics of the patient that influence a different cost of his care, specifically, the different behaviour of these factors depending on the unit considered: encounter, episode or patient.
MethodsObservational study with the voluntary participation of 13 physicians (9 general practitioners and 4 paediatricians) and nursing staff. During 7 months all diagnoses and interventions to a sample of attended patients were gathered. The ost of care was calculated and aggregated depending on the three units, and four models of multiple lineal regression were built with the following explanatory variables: age, gender, morbidity (ambulatory diagnosis groups), comorbidity and psychosocial condicionants.
Results1,868 adult patients (more than 14 years) made 11.146 consults which belong to 4,772 episodes. The 895 paediatric patients made 6,254 consults that belonged to 3,416 episodes. Morbidity is the variable that shows a major increase in all units. Overall, the apacity to explain cost variations are: 0.03 for the encounter, 0.14 for the episode and 0.44 for the patient.
ConclusionsThe patients variables considereded in the study explain very little the resource utilization of the encounter, more the episode, and rather more the patient. Those results indicate that the assessment or comparison of the effectiveness, efficiency, or quality of the encounters will be very dificult considering only the commonly used variables to control the patient factors. The patient classification systems that group with a similar complexity that use the visits as the unit, should, consequently, consider additional variables of the process of care in contrast with the others units. This have implications in the collection and availability of the information.