Frontier-based techniques in measuring hospital efficiency in Iran: a systematic review and meta-regression analysis

Table 4 Results of the meta-regression analysis

	Model 1	Model 2	Model 3	Model 4	Model 5	Model 6	Model 7	Model 8
Ln (Size)	−0.088*	−0.081	−0.077**	−0.083**	−0.080*	−0.094**	−0.097**	−0.101***
Ln (Dimension)	0.197***	0.174***	0.172**	0.195***	0.200***	0.216***	0.198***	0.204***
SFA		−0.065
Pooled		0.060
Output orientation		0.035
Heterogeneity in location			−0.033
Heterogeneity in activity				0.020
Heterogeneity in ownership status					0.041
Heterogeneity in type of hospital						0.069*	0.072**	0.069*
Published from 2010 onwards							−0.071**	−0.076**
Percentage of teaching hospitals in sample								−0.077
Constant	0.731 ***	0.667 ***	0.754***	0.705***	0.691***	0.669***	0.750***	0.779***
N	43	43	43	43	43	43	43	36
R-squared	0.290	0.336	0.298	0.294	0.305	0.354	0.423	0.456

SFA = stochastic frontier analysis.
***, ** and * shows the 1%, 5% and 10% significance level, respectively; standard errors adjusted for clustered observations.

ISSN: 1472-6963