Introduction: Hospitals are the centers consuming most of the resources in the health sector. Determining the efficiency of hospitals is very beneficial when resources are limited. To determine efficiency of an organization, several indicators are used for comparison. Pabon Lasso Graph is one of the techniques that simultaneously compares these indicators. The main purpose of this study was to determine the efficiency of social security hospitals of Tehran based on Pabon Lasso Model in 2011.
Methods: This descriptive cross-sectional study was carried out in seven hospitals under the direct supervision of social security in Tehran in 2011.
 Results: In this study, the average bed occupancy rate, average length of stay and bed turnover rate in hospitals were 77/75%, 4/03 days, and 82/29 per year, respectively. The results showed two hospitals were in zone I, a hospital in zone II, a hospital in zone III and three hospitals were located in zone IV. And only one hospital was efficient.
Conclusion: The findings showed that only one hospital (14/2%) from seven hospitals appeared to be efficient. Hospital manager should take into consideration the hospitals that were inefficient.

Keywords: Performance assessment, Efficiency, Hospitals, Pabon lasso model

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