Table 3.

Factor loadings from the rotated factor structure matrix for the modified SSI: Principal components analysis with promax (oblique) rotation

		Two factors		Three factors			Four factors
		1	2	1	2	3	1	2	3	4
Jaw muscle pain	Freq	0.79	0.04	0.37	−0.09	0.66	0.49	−0.07	0.58	0.01
	Dur	0.69	0.12	0.26	−0.03	0.70	0.45	−0.01	0.63	−0.08
	Int	0.89	0.01	0.75	0.03	0.20	0.74	0.05	0.11	0.15
	Unpl	0.92	−0.01	0.77	0.01	0.21	0.78	0.03	0.12	0.14
	Endur	0.88	0.03	0.78	0.06	0.14	0.77	0.08	0.06	0.16
Jaw joint pain	Freq	0.75	0.05	0.43	−0.03	0.50	−0.01	−0.06	0.53	0.52
	Dur	0.65	0.13	0.32	0.04	0.52	−0.07	0.01	0.56	0.45
	Int	0.85	0.03	0.83	0.08	0.03	0.15	0.06	0.03	0.79
	Unpl	0.88	0.02	0.83	0.07	0.08	0.14	0.04	0.08	0.81
	Endur	0.86	0.05	0.86	0.10	0.01	0.34	0.10	0.01	0.61
Temple pain	Freq	0.10	0.74	−0.10	0.61	0.42	−0.03	0.62	0.39	−0.05
	Dur	−0.03	0.83	−0.29	0.69	0.50	−0.14	0.70	0.47	−0.14
	Int	0.03	0.90	0.17	0.87	−0.06	0.06	0.88	−0.05	0.09
	Unpl	−0.01	0.94	0.15	0.92	−0.08	0.03	0.92	−0.06	0.09
	Endur	0.13	0.78	0.29	0.79	−0.11	0.18	0.80	−0.11	0.10

− Loadings >|0.5| are presented as bolded font − Shaded cells represent the clustering of each factor