Table 2.

Quality assessment by using the Newcastle-Ottawa Scale for the included studies

First author [Ref.], year	Representative of sarcopenia patients	Selection of control	Ascertain of sarcopenia measurement	Outcome of interest not present at start	Comparability of cohorts	Assessment of outcome	Enough follow-up period	Adequacy of follow-up	Total points
Dodson [31], 2013	*	*	*	*	**	*	*	*	9
Harimoto [21], 2013	*	*	*	*	*	*	*	*	8
Meza-Junco [29], 2013	*	*	*	*	**	*	-	*	8
Itoh [22], 2014	*	*	*	*	**	*	*	*	9
Fujiwara [20], 2015	*	*	*	*	**	*	*	*	9
Iritani [28], 2015	*	*	*	*	**	*	*	*	9
Levolger [24], 2015	*	*	*	*	**	*	*	*	9
Valero [30], 2015	*	*	*	*	**	*	*	*	9
Voron [26], 2015	*	*	*	*	**	*	*	*	9
Kamachi [23], 2016	*	*	*	*	*	*	*	*	8
Takagi [25], 2016	*	*	*	*	**	*	*	*	9
Yabusaki [27], 2016	*	*	*	*	**	*	-	-	7
Hiraoka [32], 2017	*	*	*	*	**	*	*	*	9