Table 2.

Methodological quality appraisal of the included studies using the Newcastle-Ottawa Scale.

Study	Selectiona					Comparabilitya			Outcomeb			Statistics
	Representation of the sample	Sample size	Non-respondents	Description of players	Subtotal	Control for most important factor (training experience)	Control for other factors (starting strength or power)	Subtotal	Assessment of outcome	Statistical test	Subtotal	Total (out of 10)	High (>7)	Mod-high (5-7)	Low (<5)
Comfort et al., 2012	1	1	0	1	3	0	0	0	2	2	4	7	0	1	0
Harris et al., 2008	1	0	0	1	2	0	1	1	1	2	3	6	0	1	0
O’Connor and Crowe, 2007	1	0	0	1	2	0	0	0	2	2	4	6	0	1	0
Rogerson et al., 2007	1	0	0	1	2	0	1	1	2	2	5	7	0	1	0
de Lacey et al., 2014a	1	0	0	1	2	0	0	0	2	2	4	6	0	1	0
Daniels et al., 2019	1	1	0	1	3	0	0	0	2	2	4	7	0	1	0
Baker, 2001b	1	1	0	1	3	0	0	0	2	2	4	7	0	1	0
Crewther et al., 2011	1	1	0	1	3	0	0	0	2	2	4	7	0	1	0
Baker and Newton, 2008a	1	0	0	1	2	0	0	0	2	2	4	6	0	1	0
Baker and Newton, 2006	1	1	0	1	3	0	0	0	2	2	4	7	0	1	0
Baker and Newton, 2008b	1	0	0	1	2	0	0	0	2	2	4	6	0	1	0
Baker, 2013	1	0	0	1	2	0	0	0	2	2	4	6	0	1	0

^a subscale items rated 0-1;

^b subscale items rated 0-2.