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.