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. Author manuscript; available in PMC: 2019 May 15.
Published in final edited form as: Compr Psychiatry. 2012 Feb 2;53(6):679–690. doi: 10.1016/j.comppsych.2011.12.001

Table 2.

Goodness-of-fit indices for CFA of ADHD and PTSD

Model df χ2 P RMSEA TLI CFI Models compared χ2 Difference test
a. 1-factor ADHD 49 256.89 <.001 0.14 0.85 0.78 - -
b. 2-factor ADHD 52 125.19 <.001 0.08 0.95 0.92 b vs a 47.57 (P <.001)
c. 3-factor ADHD 53 109.55 <.001 0.07 0.96 0.94 c vs b 17.02 (P <.001)
d. 4-factor PTSD (Numbing) 113 179.32 <.001 0.05 0.92 0.93 - -
e. 4-factor PTSD (Dysphoria) 113 204.34 <.001 0.06 0.88 0.90 - -
f. Best-fitting ADHD + PTSD 100 183.63 <.001 0.06 0.92 0.84 - -
g. D3 cross-loading on INAT 101 163.45 <.001 0.05 0.94 0.88 - -
h. Hypothesized paths only 76 124.00 <.001 0.05 0.94 0.91 h vs g 5.77 (P = .123)

Numbing indicates the model of PTSD by King et al; Dysphoria, the model of PTSD by Simms et al; D3, difficulty concentrating; INAT, ADHD inattention factor.