Table 5 Descriptive statistics for clusters

Gender

 Girls, n (% of cluster)

6 (54.5)

24 (60.0)

54 (80.6)

 Boys, n (% of cluster)

2 (18.2)

16 (40.0)

10 (14.9)

 Non-binary, n (% of cluster)

3 (27.3)

0 (0.0)

3 (4.5)

NSSI

 Positive on NSSI single-item, n (% of cluster)

10 (90.91)

7 (17.50)

38 (56.72)

 Positive (exclusively) on NSSI behavioral checklist, n (% of cluster)

1 (9.09)

33 (82.50)

29 (43.28)

 Age at first NSSI episode, M (SD)

11.33 (2.09)

11.66 (2.59)

11.62 (2.44)

 Number of NSSI methods, M (SD)

9.09 (0.83)

2.35 (1.35)

5.33 (2.17)

 Five or more NSSI methods, n (% of cluster)

11 (100)

3 (7.5)

46 (68.66)

 Number of NSSI episodes during the last year, M (SD)

46.86 (70.98)

14.23 (34.92)

40.76 (145.63)

 Five or more NSSI episodes during last year, n (% of cluster)

7 (63.64)

9 (22.50)

33 (49.25)

Suicidality

 Suicidal ideation n (% of cluster)

11 (100.00)

8 (20.00)

41 (61.19)

 Suicide attempt n (% of cluster)

9 (81.82)

1 (2.50)

8 (11.94)

Emotion regulation and self-criticism

 DERS-16, M (SD)

64.36 (8.26)

29.95 (7.33)

51.03 (12.45)

 SRS, M (SD)

46.73 (6.37)

20.40 (7.6)

32.21 (8.66)

Quality of life

 KIDSCREEN-52 total, M (SD)

122.00 (20.8)

186.3 (22.58)

156.82 (21.15)