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Predictors of mortality in HIV-associated hospitalizations in Portugal: a hierarchical survival model.

Dias SS, Andreozzi V, Martins MO, Torgal J - BMC Health Serv Res (2009)

Bottom Line: On the other hand tuberculosis was associated with a reduced risk of death.Central hospital discharge also presents less risk of mortality.The frailty variance was small but statistically significant, indicating hazard ratio heterogeneity among hospitals that varied between 0.67 and 1.34, and resulted in two hospitals with HR different from the average risk.The frailty model suggests that there are unmeasured factors affecting mortality in HIV associated hospitalizations.

View Article: PubMed Central - HTML - PubMed

Affiliation: Higher Institute of Statistics and Information Management, New University of Lisbon, Lisbon, Portugal. sdias@isegi.unl.pt

ABSTRACT

Background: The beneficial effects of highly active antiretroviral therapy, increasing survival and the prevention of AIDS defining illness development are well established. However, the annual Portuguese hospital mortality is still higher than expected. It is crucial to understand the hospitalization behaviour to better allocate resources. This study investigates the predictors of mortality in HIV associated hospitalizations in Portugal through a hierarchical survival model.

Methods: The study population consists of 12,078 adult discharges from patients with HIV infection diagnosis attended at Portuguese hospitals from 2005-2007 that were registered on the diagnosis-related groups' database.We used discharge and hospital level variables to develop a hierarchical model. The discharge level variables were: age, gender, type of admission, type of diagnoses-related group, related HIV complication, the region of the patient's residence, the number of diagnoses and procedures, the Euclidean distance from hospital to the centroid of the patient's ward, and if patient lived in the hospital's catchment area. The hospital characteristics include size and hospital classification according to the National Health System. Kaplan-Meier plots were used to examine differences in survival curves. Cox proportional hazard models with frailty were applied to identify independent predictors of hospital mortality and to calculate hazard ratios (HR).

Results: The Cox proportional model with frailty showed that male gender, older patient, great number of diagnoses and pneumonia increased the hazard of HIV related hospital mortality. On the other hand tuberculosis was associated with a reduced risk of death. Central hospital discharge also presents less risk of mortality.The frailty variance was small but statistically significant, indicating hazard ratio heterogeneity among hospitals that varied between 0.67 and 1.34, and resulted in two hospitals with HR different from the average risk.

Conclusion: The frailty model suggests that there are unmeasured factors affecting mortality in HIV associated hospitalizations. Consequently, for healthcare policy purposes, hospitals should not all be treated in an equal manner.

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KM estimates of survival for selected variables: gender, age, type of admission and type of DRG.
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Figure 2: KM estimates of survival for selected variables: gender, age, type of admission and type of DRG.

Mentions: KM exploratory analysis suggests that hospitalization from older patients, men, urgently admitted, and those with medical DRG were associated with a faster progression to death (Figure 2).


Predictors of mortality in HIV-associated hospitalizations in Portugal: a hierarchical survival model.

Dias SS, Andreozzi V, Martins MO, Torgal J - BMC Health Serv Res (2009)

KM estimates of survival for selected variables: gender, age, type of admission and type of DRG.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2725041&req=5

Figure 2: KM estimates of survival for selected variables: gender, age, type of admission and type of DRG.
Mentions: KM exploratory analysis suggests that hospitalization from older patients, men, urgently admitted, and those with medical DRG were associated with a faster progression to death (Figure 2).

Bottom Line: On the other hand tuberculosis was associated with a reduced risk of death.Central hospital discharge also presents less risk of mortality.The frailty variance was small but statistically significant, indicating hazard ratio heterogeneity among hospitals that varied between 0.67 and 1.34, and resulted in two hospitals with HR different from the average risk.The frailty model suggests that there are unmeasured factors affecting mortality in HIV associated hospitalizations.

View Article: PubMed Central - HTML - PubMed

Affiliation: Higher Institute of Statistics and Information Management, New University of Lisbon, Lisbon, Portugal. sdias@isegi.unl.pt

ABSTRACT

Background: The beneficial effects of highly active antiretroviral therapy, increasing survival and the prevention of AIDS defining illness development are well established. However, the annual Portuguese hospital mortality is still higher than expected. It is crucial to understand the hospitalization behaviour to better allocate resources. This study investigates the predictors of mortality in HIV associated hospitalizations in Portugal through a hierarchical survival model.

Methods: The study population consists of 12,078 adult discharges from patients with HIV infection diagnosis attended at Portuguese hospitals from 2005-2007 that were registered on the diagnosis-related groups' database.We used discharge and hospital level variables to develop a hierarchical model. The discharge level variables were: age, gender, type of admission, type of diagnoses-related group, related HIV complication, the region of the patient's residence, the number of diagnoses and procedures, the Euclidean distance from hospital to the centroid of the patient's ward, and if patient lived in the hospital's catchment area. The hospital characteristics include size and hospital classification according to the National Health System. Kaplan-Meier plots were used to examine differences in survival curves. Cox proportional hazard models with frailty were applied to identify independent predictors of hospital mortality and to calculate hazard ratios (HR).

Results: The Cox proportional model with frailty showed that male gender, older patient, great number of diagnoses and pneumonia increased the hazard of HIV related hospital mortality. On the other hand tuberculosis was associated with a reduced risk of death. Central hospital discharge also presents less risk of mortality.The frailty variance was small but statistically significant, indicating hazard ratio heterogeneity among hospitals that varied between 0.67 and 1.34, and resulted in two hospitals with HR different from the average risk.

Conclusion: The frailty model suggests that there are unmeasured factors affecting mortality in HIV associated hospitalizations. Consequently, for healthcare policy purposes, hospitals should not all be treated in an equal manner.

Show MeSH
Related in: MedlinePlus