Table 2. Multiple linear regression model of factors associated with higher vulnerability index (VI) scores.

Factors	Slope (β) [95%CI]	t-score	p-value
Unipolar > bipolar depression	0.946 [+0.469 to+1.42]	4.04	<0.0001
Less self-reported suicidal ideation	–0.199 [–0.302 to –0.096]	3.94	<0.0001
Self-rated depression	+0.005 [+0.011 to+0.021]	0.66	0.512

VI score was associated more strongly with unipolar than bipolar (I or II) depression and with lower self-ratings of suicidal ideation or wish to die, but was not associated with self-reported depressed mood. Factors not associated with VI score included sex, age, clinician-rated dysphoria, and self-ratings of dysphoria, vital drive, anxiety, unusual bodily experiences, autonomic symptoms, or total morbidity.