Table 3.

PROMIS applied cognition - general concerns item set: Item loadings (λ) from the unidimensional confirmatory factor analysis (Mplus) for the first half of the random sample (n = 2,739), Schmid-Leiman bi-factor model with two and three group factors (performed with R for the second random half of the sample) and Mplus bi-factor two group solution for the second random half of the sample (n = 2,738)

Item Description	One Fact* λ (s.e.)	Schmid-Leiman Bi-Factor Three and Two Group Factor Solutions									Mplus Bi-Factor Two Group Factor Solution (Based on S-L** Result)
		G λ	F1 λ	F2 λ	F3 λ	h2	G λ	F1 λ	F2 λ	h2	G λ (s.e.)	F1 λ (s.e.)	F2 λ (s.e.)
I have had trouble forming thoughts	0.94 (0.003)	0.89		0.32		0.89	0.91		0.24	0.89	0.90 (0.005)		0.27 (0.015)
My thinking has been slow	0.95 (0.003)	0.91		0.32		0.93	0.93		0.25	0.93	0.92 (0.004)		0.36 (0.015)
My thinking has been foggy	0.95 (0.003)	0.92		0.23		0.91	0.93			0.91	0.94 (0.003)		0.13 (0.009)
I have had trouble concentrating	0.95 (0.003)	0.92				0.90	0.93			0.89	0.96 (0.002)
I have had to work really hard to pay attention or I would make a mistake	0.95 (0.003)	0.92	0.23			0.91	0.92	0.24		0.91	0.94 (0.003)	0.15 (0.011)
It has seemed like my brain was not working as well as usual	0.96 (0.002)	0.93				0.91	0.93			0.91	0.96 (0.002)
I have had to work harder than usual to keep track of what I was doing	0.97 (0.002)	0.93	0.26			0.93	0.93	0.25		0.93	0.94 (0.003)	0.20 (0.013)
I have had trouble shifting back and forth between different activities that require thinking	0.96 (0.002)	0.93	0.26			0.92	0.93	0.25		0.92	0.93 (0.004)	0.31 (0.015)

^*Geomin (oblique) rotation

^**Schmid-Leiman bi-factor model, three group factors solution with no loadings on the 3^rd group factor; 2 group factor solution did not converge in Mplus

Note: Comparative fit index (CFI) for the Mplus one-factor solution is 0.996 and for the bi-factor solution is 0.999 h² is the communality. G λ are the loadings on the general factor; F1λ through F3 λ are the loadings on the group factors