Table 6. Cost efficiency index.

	Model-Ia		Model-IIb		V(II-I)c
	Mean	S.D.	Mean	S.D.	Mean
Cost efficiency index	0.730	0.124	0.974	0.035	0.244

^aModel-I = Cost efficiency index under model omitting heterogeneity factors

^bModel-II = Cost efficiency index under model accounting for heterogeneity factors

^cV(II-I) = Cost efficiency index (Model II)—Cost efficiency index (Model I)