Table 3.

Summary of the dosimetry quality audits of linear accelerators installed at nine different sites (${\mathrm{S}}_{\mathrm{n}}$) from 1989 to 2015

Site $(S_n)$	Audits Period	Beam Energy (MV)	No. of Audits	$\mathit{\text{Mean}}\hspace{0.17em}(\pm )$	SD	$\mathit{\text{Minimum}}\hspace{0.17em}(\pm )$	$\mathit{\text{Maximum}}\hspace{0.17em}(\pm )$
S14	2004‐2015	6	5	3.24	2.16	0.8	6.5
		15	5	3.45	1.49	0.95	4.8
S15	2008‐2014	6	4	0.62	0.64	0.2	1.57
		15	4	0.71	0.65	0.16	1.5
S16	1997‐2015	6	7	1.50	0.67	0.7	2.5
		15	7	1.76	1.02	0.28	3.2
S17	1989‐2013	6	7	0.79	0.5	0.11	1.32
		10/15	3	1.6	1.05	0.48	2.56
S18	2002‐2010	6	5	2.01	0.99	0.82	3.4
		10/15	5	1.98	0.91	0.41	2.7
S19	2007‐2015	6	7	1.08	0.75	0.2	2.2
		18	4	1.12	0.45	0.73	1.6
S20	1995‐2014	6	4	0.84	0.62	0.1	1.6
		15	4	0.98	0.79	0.1	2.01
S21	2006‐2010	6	3	0.74	0.37	0.44	1.15
		15	3	1.02	0.83	0.3	1.93
S22	2012‐2015	6	2	0.8	0.57	0.4	1.2