Table 3.

Factor scores, standard errors, and ordinal alpha for tested models for American Indian and Caucasian American adults ages 18 and over.

	American Indian			Caucasian American
Tested Models	Mean (SE)	α	n	Mean (SE)	α	n
1) One-factor PHQ-9a	11.41 (0.19)	0.94	1,806	7.93 (0.18)	0.95	1,811
2A) Two-factor PHQ-9b
Factor 1	7.40 (0.10)	0.89	2,282	5.31 (0.10)	0.90	2,223
Factor 2	4.23 (0.08)	0.90	2,411	2.85 (0.07)	0.92	2,482
2B) Two-factor PHQ-9c
Factor 1	5.32 (0.06)	0.86	2,686	4.21 (0.06)	0.88	2,588
Factor 2	6.11 (0.12)	0.92	2,149	3.85 (0.10)	0.94	2,245
2C) Two-factor PHQ-9d
Factor 1	8.88 (0.13)	0.91	2,123	6.27 (0.13)	0.92	2,050
Factor 2	2.78 (0.05)	0.87	2,622	1.88 (0.05)	0.90	2,722
2D) Two-factor PHQ-9e
Factor 1	6.15 (0.08)	0.86	2,443	4.59 (0.08)	0.87	2,386
Factor 2	5.38 (0.10)	0.91	2,260	3.51 (0.09)	0.93	2,322
2E) Two-factor, seven-item PFtQ-9f
Factor 1	4.23 (0.08)	0.90	2,411	2.85 (0.07)	0.92	2,482
Factor 2	5.32 (0.06)	0.86	2,686	4.21 (0.06)	0.88	2,588

Notes. SE = Standard error. α = Ordinal alpha (Zumbo et al., 2007). Count data unless otherwise specified. Factor means, standard errors, and ordinal alpha were calculated only with complete data on all included PHQ-9 questions. Rounded to nearest hundredth place.

^aKroenke et al. (2001).

^bRichardson and Richards (2008).

^cKrause et al. (2008).

^dKrause et al. (2010).

^ede Jonge et al. (2007).

^fGranillo (2012).