. Author manuscript; available in PMC: 2022 Oct 26.

Published in final edited form as: CNS Spectr. 2021 Apr 23;27(5):604–612. doi: 10.1017/S1092852921000274

Table 1. Demographic and clinical characteristics of participants.

	Controls n = 190		Lifetime NSSI n = 50			Sporadic NSSI n = 28		Repetitive NSSI n = 22
	M	SD	M	SD	p	M	SD	M	SD	p
Age (years)	16.38	0.47	16.32	0.40	0.47	16.38	0.41	16.25	0.37	0.23
Full IQ^a	106.25	16.21	104.70	17.10	0.55	103.50	17.30	106.23	17.12	0.58
MFQ Score^b	11.39	7.64	18.78	10.29	<0.001	16.89	10.09	21.18	10.27	0.15
	n	%	n	%	p	n	%	n	%	p
Female	89	46.84	37	74	0.001	20	71.43	17	77.27	0.64
White ethnicity	175	92.11	42	84	0.17	23	82.14	19	86.36	0.78
High SES^c	164	86.32	44	88	0.68	22	78.57	22	100	0.07
Lifetime psychiatric diagnosis	23	12.11	21	42	<0.001	8	28.57	13	59.09	0.045

Contrasts compared lifetime NSSI vs controls and sporadic NSSI vs repetitive NSSI. Bold indicates significant group differences.

Abbreviations: MFQ, Moods and Feelings Questionnaire; SES, socioeconomic status.

intellectual ability measured via the vocabulary and block design subtests of the Wechsler Intelligence Scale for ChildrenIII, UK version (39).

Depressive symptoms in the past two weeks measured via the Moods and Feelings Questionnaire (40).

Socioeconomic status (SES) binarized based on ACORN status as high (‘wealthy’, ‘urban prosperity’, ‘comfortably off) vs low (‘moderate means’, ‘hard pressed’).