“…The control variables can take place as institutional and environmental factors, although they differ according to the purpose of the research (Bobo et al, 2018). Numbers of hospitals, beds, physicians, nurses þ midwives and other health personnel used as inputs in this study were also used as inputs in the studies conducted by Afonso and Aubyn (2011), Mutter et al (2008), Bilsel and Davutyan (2014), Lobo et al (2014), Karagiannis (2015), Samut and Cafri (2016), Chowdury and Zelenyuk (2016), Nistor et al (2017), Guo et al (2017), Du (2018), Guerrini et al (2018), Bobo et al (2018) and Habib and Shahwan (2020). Similarly, it has been observed that the variables of number of outpatients, proportion of inpatients and surgeries and risk-adjusted crude mortality rate are used in most studies in the literature (Mutter et al, 2008;Bilsel and Davutyan, 2014;Lobo et al, 2014;Chowdury and Zelenyuk, 2016;Nistor et al, 2017;Guo et al, 2017;Du, 2018;Bobo et al, 2018;Habib and Shahwan, 2020).…”