. 2013 Mar 27;8(3):e59955. doi: 10.1371/journal.pone.0059955

Table 2. Significant differences among classes – means and standard deviations.

	DF1	DF2	F	p	η²	Class 1 (N = 297)	Class 2 (N = 87)	Class 3 (N = 55)
Characteristics of Latent Classes
Lifetime frequency of NSSI	2	436	90.34	***	.37	3.04 (1.12)^a	5.10(0.95)^c	4.29 (1.10)^b
Age of most recent NSSI	2	436	8.54	***	.05	16.24 (2.08)^a	17.21 (1.86)^a,b	17.82 (1.89)^b
Pain during NSSI	2	436	7.32	.001	–	2.05 (0.71)^a	2.31 (0.65)^b	2.23 (0.74)^b
Time elapsed NSSI	2	436	1.44	.348	–	2.19 (1.64)^a	2.22 (1.83)^a	1.86 (1.36)^a
Number of methods of NSSI	2	436	139.33	***	.48	1.78 (0.82)^a	4.40 (1.44)^c	3.65 (1.94)^b
Alone during NSSI	2	436	5.31	.005	–	2.27 (0.77)^a	2.38 (0.68)^a	2.69 (0.53)^b
Lifetime suicidal ideation/attempts	2	436	71.89	***	.25	1.62 (0.89)^a	2.33 (1.34)^b	3.53 (1.46)^c
Past year suicidal ideation	2	436	255.48	***	.54	1.27 (0.59)^a	1.37 (0.59)^a	3.58 (1.97)^b
Disclosure about suicide	2	436	19.89	***	.08	1.28 (0.63)^a	1.70 (1.01)^b	1.93 (1.08)^b
Future suicide attempt	2	436	217.16	***	.50	1.31 (0.64)^a	1.56 (0.76)^a	3.62 (1.16)^b
Total SBQ-R score	2	436	257.50	***	.62	4.40(1.61)^a	5.56(1.71)^b	10.74(1.59)^c
Psychosocial indices
Daily hassles	2	436	13.37	***	.06	1.93 (0.30)^a	1.99 (0.29)^a	2.16 (0.29)^b
Difficulties with emotion regulation	2	436	14.44	***	.06	2.85 (0.71)^a	2.89 (0.82)^a	3.43 (0.66)^b
Depressive symptoms	2	436	43.84	***	.20	2.14 (0.62)^a	2.28 (0.59)^a	2.99 (0.67)^b
Self-esteem	2	436	39.72	***	.15	3.80 (0.67)^b	3.58 (0.67)^b	2.95 (0.60)^a
Social anxiety	2	436	20.47	***	.09	1.74 (0.52)^a	1.83 (0.51)^a	2.24 (0.61)^b
Behavioral inhibition	2	436	13.37	***	.06	2.76 (0.44)^a	2.81 (0.45)^a	3.09 (0.38)^b
Delinquency	2	436	1.13	.323	–	1.48 (0.57)^a	1.58 (0.58)^a	1.55 (0.55)^a
Friendship quality	2	436	11.56	***	.05	3.19 (0.48)^b	3.09 (0.49)^b	2.85 (0.42)^a
Parental attachment	2	436	18.72	***	.08	2.87 (0.43)^c	2.68 (0.47)^b	2.52 (0.39)^a
Parental criticism	2	436	6.88	***	.03	2.11 (0.71)^a	2.29 (0.77)^a,b	2.48 (0.74)^b
Parental psychological control	2	436	9.95	***	.04	1.48 (0.36)^a	1.67 (0.44)^b	1.64 (0.39)^b

Note. Means in the same row with different superscripts are significantly different at p<.001. Higher scores indicate greater frequency of engagement in NSSI, age of most recent NSSI, pain during NSSI, time elapsed between urge to self-injure and act of NSSI, number of methods of NSSI, being alone during NSSI, more lifetime suicidal ideation/attempts, greater past year suicidal ideation, greater disclosure about suicidal behavior, and more likely to make a future suicidal attempt. Higher scores indicate greater daily hassles, difficulties with emotion regulation, depressive symptoms, self-esteem, social anxiety, behavioral inhibition, delinquency, friendship quality, parental attachment, parental criticism and parental psychological control. Scores on the SBQR range from 3–18, with a clinical cutoff score of 7. ***p<0.001.