Table 2. PROMIS applied cognition - general concerns item set: Tests of dimensionality from principal components analysis (eigenvalues by subgroup).

Statistic	Component 1	Component 2	Component 3	Component 4	Ratio Component 1/Component 2
Total Sample (n = 5,477)
Eigenvalues	7.251	0.254	0.123	0.104	28.5
Explained Variance	90.6 %	3.2 %	1.5 %	1.3 %
Random First Half Sample (n = 2,739)
Eigenvalues	7.282	0.243	0.120	0.097	30.0
Explained Variance	91.0 %	3.0 %	1.5 %	1.2 %
Females (n = 3,245)
Eigenvalues	7.221	0.268	0.134	0.110	26.9
Explained Variance	90.3 %	3.4 %	1.7 %	1.4 %
Males (n = 2,196)
Eigenvalues	7.268	0.246	0.116	0.096	29.5
Explained Variance	90.9 %	3.1 %	1.5 %	1.2 %
Age 21 to 49 (n = 1,199)
Eigenvalues	7.268	0.254	0.122	0.101	28.6
Explained Variance	90.9 %	3.2 %	1.5 %	1.3 %
Age 50 to 64 (n = 2,008)
Eigenvalues	7.285	0.231	0.123	0.103	31.5
Explained Variance	91.1 %	2.9 %	1.5 %	1.3 %
Age 65 to 84 (n = 2,234)
Eigenvalues	7.155	0.297	0.139	0.112	24.1
Explained Variance	89.4 %	3.7 %	1.7 %	1.4 %
Race/Ethnicity: Non-Hispanic White (n = 2,272)
Eigenvalues	7.325	0.229	0.116	0.095	32.0
Explained Variance	91.6 %	2.9 %	1.5 %	1.2 %
Race/Ethnicity: Non-Hispanic Black (n = 1,121)
Eigenvalues	7.240	0.272	0.131	0.100	26.6
Explained Variance	90.5 %	3.4 %	1.6 %	1.3 %
Race/Ethnicity: Hispanic (n = 1,045)
Eigenvalues	7.186	0.280	0.130	0.113	25.7
Explained Variance	89.8 %	3.5 %	1.6 %	1.4 %
Race/Ethnicity: Non-Hispanic Asians/Pacific Islanders (n = 902)
Eigenvalues	7.171	0.277	0.148	0.128	25.9
Explained Variance	89.6 %	3.5 %	1.9 %	1.6 %
Education: Less Than High School (n = 968)
Eigenvalues	7.126	0.289	0.149	0.111	24.7
Explained Variance	89.1 %	3.6 %	1.9 %	1.4 %
Education: High School (n = 1,051)
Eigenvalues	7.211	0.266	0.145	0.105	27.1
Explained Variance	90.1 %	3.3 %	1.8 %	1.3 %
Education: Some College (n = 1,762)
Eigenvalues	7.327	0.238	0.112	0.087	30.8
Explained Variance	91.6 %	3.0 %	1.4 %	1.1 %
Education: College Degree (n = 984)
Eigenvalues	7.242	0.265	0.123	0.115	27.3
Explained Variance	90.5 %	3.3 %	1.5 %	1.4 %
Education: Graduate Degree (n = 641)
Eigenvalues	7.297	0.241	0.121	0.104	30.3
Explained Variance	91.2 %	3.0 %	1.5 %	1.3 %
Hispanics Interviewed in English (n = 705)
Eigenvalues	7.267	0.266	0.118	0.106	27.3
Explained Variance	90.8 %	3.3 %	1.5 %	1.3 %
Hispanics Interviewed in Spanish (n = 335)
Eigenvalues	6.990	0.333	0.170	0.149	21.0
Explained Variance	87.4 %	4.2 %	2.1 %	1.9 %