Table 3.

Quality of the studies reporting survival outcomes between Surgery and Radiotherapy (Newcastle-Ottawa Scale)^†

Study	Selection				Comparability	Outcome			Score*
	Representativeness of exposed cohort	Selection of non exposed cohort	Ascertainment of exposure	Outcome not present at outset of study		Assessment	F/U Length	Adequacy of F/U
Arshad 2014 [7]	*	*	*	*	**	*	*	*	9
Jones 2004 [10]	*	*	*	*	**	*	*	*	9
Orus 2000 [12]	*	*	*	*		*	*	*	7
Santos 1998 [13]	*	*	*	*	*	*	*		7
Sessions 2005 [14]	*	*	*	*		*	*	*	7
Spector 1995 [15]	*	*	*	*	**	*	*	*	9
Spriano 1997 [16]	*	*	*	*	*	*	*	*	8

^*Maximum total score that a study can get is 9

^†A study can receive a maximum of 1 asterisk for each numbered item within the selection and outcome categories. A maximum of 2 asterisks can be given for comparability