Abstract
Input-orientated Data Envelopment Analysis was used to measure the technical efficiency of 7
university hospitals, 24 regional hospitals and 43 general hospitals in Thailand in year 2009. The results
revealed there were 53 efficient hospitals (71.62%) from 74 total hospitals; in addition, the percentages of
efficient hospitalsin order of highest to least percentage were university, regional, and general hospital
(85.7%, 83.3%, and 62.8%).While the percentages of scale efficiency (SE = 1) in order of highest to least
percentage were regional, university, and general hospitals (75.0%, 71.4%, and 44.2%).
The next step was to identify the determinants of hospital efficiency with regression analysis using
ordinary least squares (OLS). The results revealed three significant explanatory variables for TEVRSi scores
such as bed-physician ratio, numbers of physicians, and nurses-physician ratio. The most positive influential
determinant of TEVRS scores was bed-physician ratio; however, the negative influential determinant of
TEVRS scores was nurse-physician ratio. While the significant explanatory variable for scale efficiency (SEi)
scores was the in-patient visits adjusted with median relative weight of DRG
