Table 5.

Return to scale

Year	RTS	N	Percentage	Sig. (two tailed)†
2008	MPSS	5	10.42	0.222‡
	IRS	17	35.42
	DRS	26	54.17
2009	MPSS	6	12.50	0.164
	IRS	16	33.33
	DRS	26	54.17
2010	MPSS	5	10.42	0.014**
	IRS	13	27.08
	DRS	30	62.50
2011	MPSS	6	12.50	0.003**
	IRS	11	22.92
	DRS	31	64.58
2012	MPSS	13	27.08	0.002**
	IRS	8	16.67
	DRS	27	56.25
2013	MPSS	9	18.75	0.000***
	IRS	8	16.67
	DRS	31	64.58
2014	MPSS	10	20.83	0.000***
	IRS	5	10.42
	DRS	33	68.75

Double asterisk (**) denotes significant differences from unity at 95%, and triple asterisk (***) denotes significant differences from unity at 99%.

†Binomial test, null hypothesis: no difference in the proportion of hospitals under IRS or DRS.

‡Based on Z approximation.

DRS, decreasing returns to scale; IRS, increasing returns to scale; MPSS, most productive scale size; RTS, return to scale.