Arrangements with the NHS for providing healthcare services: do they improve financial performance of private for-profit hospitals in Spain?

Table 6 ROA for Commissioning hospitals versus no commissioning (Average-S.D) %

Sample	Total	Commissioning	No commissioning	Two-tail t-test
All	4.57–13.65	5.07–12.99	4.15–14.16	− 1.93^*
Small(^a)	2.44–15.72	3.19–16.15	2.12–15.52	− 1.04
Medium (^a)	5.46–13.77	6.32–14.09	4.75–13.47	−1.85^*
Big(^a)	5.76–10.80	4.96–9.85	6.96–12.00	2.96^***
General	3.58–13.17	4.89–12.62	2.25–13.56	−4.59^***
Surgical	0.63–14.36	1.84–13.89	2.47–14.80	0.37
Psychiatric(a)	8.30–11.99	6.83–11.99	8.86–13.01	1.31
Geriatric & long stay(a)	8.43–15.12	7.50–14.53	9.17–15.57	1.11
Other monographic	4.13–12.92	8.16–9.81	3.55–13.23	−1.42

*, ***: significant to 10 and 1%, respectively
^aSmall: < 50 beds; Medium: between 50 and 100 beds; Big: > = 50 beds
(a) Psychiatric and Geriatric & long stay are included in the category “Medium and Long stay” in the models
Source: Own elaboration