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. 2020 Aug 31;11:573530. doi: 10.3389/fpsyt.2020.573530

Table 3.

Factor loadings of 7 components comparing two extraction methods.

Model Extraction	PSQI-7				PSQI-5
Model Extraction	PCA		ML		PCA	ML
Number of Factors	1	2	2	1	1	1
Component-1	0.682^b	0.385	0.721^a	0.225	0.712^a	0.593^c
Component-2	0.606^c	0.138	0.398^e	−0.018	0.635^b	0.556^c
Component-3	0.751^a	−0.169	0.561^c	−0.228	0.741^a	0.608^c
Component-4	0.623^c	−0.353	0.460^d	−0.352	0.596^c	0.478^d
Component-5	0.541^d	0.123	0.397^e	−0.040	0.553^c	0.455^d
Component-6	−0.012	0.816^a	0.118	0.604^c
Component-7	0.060	0.446^d	0.099	0.386^e

Loadings are a = excellent, b = very good, c = good, d = fair, e = poor.

PSQI, Pittsburgh sleep quality index; PCA, principal component analysis; ML, maximum likelihood.