TABLE 1.

Descriptive statistics

	Sample 1 (N = 171)					Sample 2 (N = 191)
	n (%)	Range	Mean (SD)	Skew (SE = 0.186)	Kurtosis (SE = 0.369)	n (%)	Range	Mean (SD)	Skew (SE = 0.176)	Kurtosis (SE = 0.350)
Dichotomous variables
Gender (female)	88 (51.5)	n/a	0.48 (0.50)	0.071	−2.019	121 (63.4)	n/a	0.37 (0.48)	0.554	1.307
Race (Caucasian)	134 (78.5)	n/a				149 (78)	n/a
Ethnicity (Hispanic)	10 (5.8)	n/a				12 (6.3)	n/a
NSSI—Past year (Yes)	30 (17.5)	n/a				–	–	–	–	–
NSSI—Lifetime (Yes)	58 (33.9)	n/a	0.34 (.48)	0.685	−1.548	112 (58.6)	n/a	0.59 (0.49)	−0.351	1.123
Suicidal ideation—Past year (Yes)	43 (25.1)	n/a				105 (55)	n/a
Suicide attempt—Past year (Yes)	37 (21.6)	n/a				5 (2.6)	n/a
Suicide attempt—Lifetime (Yes)	55 (32.2)	n/a	0.32 (0.47)	0.77	−1.423	84 (44)	n/a	0.44 (0.50)	0.243	1.059
Continuous or ordinal variables
Age	n/a	19–71	37.36 (11.77)	0.715	−0.243	n/a	18–73	35.44 (11.36)	0.647	2.859
Lifetime total suicide attempts	n/a	0–15	1.18 (2.55)	3.212	11.857	n/a	0–16	1.44 (2.70)	3.311	16.053
Past year suicidal ideation score	n/a	0–5	0.85 (1.64)	1.678	1.212	n/a	0–5	1.47 (1.69)	0.734	2.069
Rumination	n/a	0–60	23.34 (15.33)	0.247	−0.884	n/a	8–40	18.96 (7.84)	0.577	2.896
Feelings Trigger Action	n/a	1–4.44	2.33 (0.90)	0.383	−0.873	n/a	1.2–4.9	2.93 (0.84)	0.204	2.351
Pervasive Influence of Feelings	n/a	1–5	2.88 (1.13)	0.055	−1.02	n/a	1–5	3.67 (0.91)	−0.634	2.819
Lack of Follow Through	n/a	1–4.34	2.34 (0.85)	0.117	−1.012	n/a	1–4.8	2.93 (0.84)	−0.183	2.488

Notes: Gender is coded as 0 = female, 1 = male; one nonbinary person was excluded from analyses in study 1. Rumination = perseverative thinking (PTQ) in sample 1, Suicide Rumination Scale in sample 2. Suicidal ideation and attempts were assessed using the Columbia-Suicide Severity Rating Scale. NSSI was assessed with the Deliberate Self-Harm inventory in sample 1, and the Columbia-Suicide Severity Rating Scale in sample 2.