Table 2.

Standard quality criteria survey for studies reporting principal component analysis in sports.

Item	Reported	Non-Reported	Recommended Criteria
Statistical Analysis Section
Was the initial number of variables reported?	Yes = 1	No = 0	-
Was the variable selection criterion reported based on sports characteristics?	Yes = 1	No = 0	-
Was a correlation matrix exploration (factorability) between variables performed?	Yes = 1	No = 0	-
Was a correlation retention loading criterion (factorability) reported?	Yes = 1	No = 0	Factorability > 5
Was the number of variables reported after correlation matrix exploration (factorability)?	Yes = 1	No = 0	-
Were the variables scaled and centered (if necessary)?	Yes = 1	No = 0	-
Was the data suitability (sample adequacy criteria) test performed?	Yes = 1	No = 0	KMO test
Was the data suitability (sample adequacy criteria) testing result reported?	Yes = 1	No = 0	KMO > 5
Was the data suitability (sphericity criteria) test performed?	Yes = 1	No = 0	Bartlett´s Test
Was the data suitability (sphericity criteria) testing result reported?	Yes = 1	No = 0	p < 0.05
Was the extraction method reported?	Yes = 1	No = 0	PCA
Were the retention criteria (factors) reported?	Yes = 1	No = 0	Eigenvalues > 1
Were the retention criteria (loadings) reported?	Yes = 1	No = 0	Loadings > 0.6—0.7
Was the cross-loading retention criterion reported?	Yes = 1	No = 0	Highest loading
Was the rotation method reported?	Yes = 1	No = 0	VariMax (may vary)
Was the post PCA following analysis reported?	Yes = 1	No = 0	-
Results section
Was the number of factors extracted reported?	Yes = 1	No = 0	-
Was the final number of variables reported?	Yes = 1	No = 0	-
Were partial and total variance reported?	Yes = 1	No = 0	-
Was the percentage of total variance reported?	Yes = 1	No = 0	-
Were the eigenvalues reported?	Yes = 1	No = 0	-
Were the final variables selection reported?	Yes = 1	No = 0	-
Total punctuation	21	0