Table 2.

Clinical and demographic characteristics of the sample.

	Controls N=31	MDD N=51	Control v. MDD (χ², p-value)	MDD Suicide Attempters N=15	MDD Non- Attempters N=36	Attempter vs. Non-Attempter (χ², p-value)
Females	16 (51.6%)	28 (54.9%)	0.08, p=0.77	8 (53.3%)	20 (55.6%)	0.021, 0.88
Inpatient	-	14 (27.5%)	-	6 (40.0%)	8 (22.2%)	2.13, 0.15
# with family history of MDD in 1^st degree relatives	-	25 (49.0%)	-	5 (33.3%)	20 (55.6%)	2.09, 0.15
Current or Past Comorbid Anxiety Disorder	-	32	-	7 (46.7%)	25 (69.4%)	2.35, 0.13
Axis 2 Comorbidity	-	21 (37.2)	-	6 (40.0%)	13 (36.1%)	.069, .69
Race/Ethnicity			0.105^*			0.09^*
Asian	6 (19.4%)	3 (5.9%)		0 (0%)	3 (8.3%)
African American	6 (19.4%)	5 (9.8%)		3 (20%)	2 (5.6%)
Caucasian	15 (48.4%)	33 (64.7%)		8 (53.3)	26 (72%)
Hispanic	2 (3.2%)	8 (15.7%)		2 (13.3%)	5 (13.9%)
>1 Race	1 (3.2%)	2 (3.9%)		2 (13.3%)	0 (0%)
Unknown	1 (3.2%)	0 (0%)		0 (0%)	0 (0%)
Any Current Tobacco Use	2 (6.5%)	7 (13.7%)	0.47^*	1 (6.7%)	6 (16.7%)	0.66^*
			(t, p-value)			(t, p-value)
Age	32.6 ± 11.3	40.3 ± 10.7	−3.02, p=.004	38.5 ± 11.5	41.0 ± 10.5	−0.76, 0.45
Hamilton Depression Rating Scale (24 item)	1.7 ± 2.4	24.6 ± 6.4	−19.01, p<.001	26.5 ± 6.2	23.8 ± 6.4	1.40, 0.17
Beck Depression Inventory	1.3 ± 1.7	25.7 ± 8.8	−15.19, p<.001	27.5 ± 9.2	24.9 ± 8.7	0.94, 0.35
Median # of Depressive Episodes	-	4	-	5	2.5	−1.70, 0.088^**
Median Length of Current Depressive Episode (weeks) ^***	-		52	52	52	−1.15, 0.25^**
Age at 1^st Depressive Episode	-	19.3 ± 10.8	-	14.7 ± 5.8	21.2 ± 11.9	−2.03, 0.05
# of Suicide Attempters	-	15 (29.4%)	-	15 (100%)	-	-
Mean # of Attempts				2.1 ± 1.6	-	-
Maximum Lethality of Attempts^****				2.3 ± 2.0	-	-
Lethality of Most Recent Attempt				1.5 ± 1.6	-	-

Fisher’s exact p-value as cells contain values too small to fulfill assumptions of χ² test

^**

Mann Whitney Test presented as (Z, p-value), as data are not normally distributed.

^***

Best estimate from patient self report

^****

From Columbia University Suicide History Form (details in methods)