Table 4.

Regression analysis summary results

Model Number	Model independent variables^	Breusch-Pagan test†	Model variables significantly associated with ln(SGI)¶	F-test Adj R2	AIC	LR‡
1 (base)	sex, age, CTD diagnosis, OCD diagnosis, TTS, DOCS, ASRS-5	χ2(1) = 1.36 p = 0.24	OCD diagnosis: t = 2.7, p = 0.01 DOCS: t = 3.6, p < 0.001 ASRS-5: t = 6.3, p < 0.001	F(7,199) = 30.9 p < 0.0001 adj R2 = 0.50	70.6	-
2	sex, age, OCD diagnosis, DOCS, ASRS-5	χ2(1) = 0.77 p = 0.38	OCD diagnosis: t = 2.6, p = 0.01 DOCS: t = 3.5, p < 0.001 ASRS-5: t = 8.1, p < 0.001	F(5,201) = 43.1 p < 0.0001 adj R2 = 0.51	67.8	χ2(2) = 1.3 p = 0.53
3	sex, age, CTD diagnosis, TTS, ASRS-5	χ2(1) = 0.03 p = 0.87	ASRS-5: t = 10.5, p < 0.001	F(5, 201) = 29.8 p < 0.0001 adj R2 = 0.41	104.0	χ2(2) = 37.4 p < 0.0001
4	sex, age, CTD diagnosis, OCD diagnosis, TTS, DOCS	χ2(1) = 5.37 p = 0.02	OCD diagnosis: t = 3.7, p < 0.001 DOCS: t = 5.5, p < 0.001	F(6,200) = 24.6 p < 0.0001 adj R2 = 0.41	106.2	χ2(2) = 37.6 p < 0.0001
5	sex, age, CTD diagnosis, OCD diagnosis, TTS, DOCS, ASRS-5, GAD-7, PHQ-9	χ2(1) = 1.89 p = 0.17	OCD diagnosis: t = 2.7, p = 0.007 DOCS: t = 2.0, p = 0.049 ASRS-5: t = 5.1, p < 0.001	F(9,197) = 24.6 p < 0.0001 adj R2 = 0.51	70.8	χ2(2) = 3.8 p = 0.15

^†Null hypothesis of the Breusch-Pagan test is that the variance of the model residuals is constant; p<0.05 indicates significant heteroskedasticity.

^‡Referent for LR is Model 1

^¶Variables not displayed in this column were not significantly associated with ln(SGI) for the given model. Β coefficients are not reported.

^{^}VIF > 5 for TTS and CTD diagnosis in all models where these variables were included