. 2011 Jun 20;11:93. doi: 10.1186/1471-2288-11-93

Table 1.

Sequence of models concerning the Edinburgh Postnatal Depression Scale (EPDS): A) One-dimensional Confirmatory Factor Analysis; B) Exploratory/Confirmatory Factor Analysis (E/CFA); C) Three-factor Confirmatory Factor Analysis; D) Bifactor model: three specific factors plus a general (g) factor.

	Model A 1-factor CFA		Model B 3-factor - E/CFA				Model C 3-factor CFA				Model D Bifactor model

	Factor 1		Factor 1	Factor 2	Factor 3		Factor 1	Factor 2	Factor 3		Factor 1	Factor 2	Factor 3	g-factor
	λ_i(1)^a	δ_i^b	λ_i(1)	λ_i(2)	λ_i(3)	δ_i	λ_i(1)	λ_i(2)	λ_i(3)	δ_i	λ_i(1)	λ_i(2)	λ_i(3)	λ_{i (G)}	δ_i
i1	.74 (.70; .79)	.45	.81 (.47; 1.0)	.05 (-.23; .37)	-.02 (-.19; .16)	0.30	.82 (.77; .86)			.33	.48 (.25; .72)			.68 (.62; .74)	.30
i2	.71 (.66; .76)	.49	.83 (.66; 1.0)	-.03 (-.15; .1)	.01 (-.18; .21)	0.33	.78 (.73; .83)			.39	.50 (.26; .74)			.65 (.59; .71)	.33
i6	.59 (.54; .65)	.64	.31 (.15; .48)	.28 (.04; .52)	.08 (-.16; .31)	.63	.65 (.59; .70)			.58	.14 (.04; .24)			.52 (.45; .59)	.63
i3	.53 (.47; .59)	.72	.00 (-.04; .04)	.68 (.39; .97)	-.07 (-.37; .23)	.61		.60 (.53; .67)		.64		.25 (.10; .40)		.51 (.45; .58)	.67
i4	.53 (.48; .59)	.715	-.07 (-.29; .15)	.67 (.40; .94)	.01 (-.18; .20)	.61		.61 (.55; .67)		.63		.46 (.19; .72)		.63 (.56; .70)	.53
i5	.64 (.58; .70)	.59	.11 (-.10; .33)	.61 (.40; .83)	.01 (-.14; .15)	.52		.74 (.68; .80)		.46		.31 (.13; .48)		.59 (.53; .65)	.50
i7	.82 (.77; .86)	.33	.01 (-.08; .10)	.145 (-.08; .37)	.70 (.51; .89)	.31			.84 (.80; .88)	.30			.17 (-.02; .35)	.81 (.75; .88)	.31
i8	.80 (.77; .84)	.35	.05 (-.09; .18)	.01 (-.04; .06)	.78 (.66; .90)	.32			.83 (.79; .87)	.31			.24 (.03; .46)	.78 (.72; .84)	.33
i9	.81 (.78; .85)	.34	-.01 (-.07; .05)	-.15 (-.46; .15)	.99 (.74; 1.00)	.24			.84 (.80; .88)	.30			.45 (.22; .68)	.77 (.71; .83)	.20
i10	.68 (.60; .76)	.54	.03 (-.18; .24)	.06 (-.27; .40)	.62 (.31; .93)	.52			.70 (.62; .78)	.51			.17 (-.06; .40)	.67 (.57; .77)	.52
f1 ⇔ f2^c	- - -		.66 (.47; .86)				.74 (.67; .81)				0
f1 ⇔ f3	- - -		.75 (.63; .87)				.80 (.76; .85)				0
f2 ⇔ f3	- - -		.82 (.69; .94)				.81 (.74; .87)				0
RMSEA ^d	.081 (.071; .091)		.037 (.019; .053)				.037 (.024; .049)				.026 (.005; .041)
CFI ^e	.963		.996				.993				.997
TLI ^f	.953		.991				.990				.995

^aLoadings (standardized). In brackets: 95% confidence intervals. ^bMeasurement errors (uniqueness). ^cFactors correlation; in brackets: 95% confidence intervals. ^dRMSEA = Root Mean Square Error of Approximation. in brackets: 90% confidence intervals. ^eCFI = Comparative Fit Index. ^fTLI = Tucker-Lewis Index.