Longitudinal Associations of Stressful Life Events with Non-suicidal Self-Injury among Chinese Adolescents: The Mediating Effect of Depressive Symptoms

Table 1

Sample characteristics by last-year NSSI at baseline.

Variables	Total ()	NSSI ()	Non-NSSI ()
Stressful life events, (%)				255.38	<0.001
Low	3699 (52.3)	492 (35.8)	3207 (56.3)
Moderate	1731 (24.5)	357 (26.0)	1374 (24.1)
High	1642 (23.2)	525 (38.2)	1117 (19.6)
Depressive symptoms, (%)				294.72	<0.001
Yes	662 (9.4)	295 (21.5)	367 (6.4)
No	6410 (90.6)	1079 (78.5)	5331 (93.6)
Age, mean (SD)	14.58 (1.46)	14.74 (1.39)	14.54 (1.47)	-4.46	<0.001
Gender, (%)				9.77	0.002
Male	3536 (50.0)	635 (46.2)	2901 (50.9)
Female	3536 (50.0)	739 (53.8)	2797 (49.1)
Ever smoking, (%)				146.64	<0.001
Yes	1339 (18.9)	418 (30.4)	921 (16.2)
No	5733 (81.1)	956 (69.6)	4777 (83.8)
Ever drinking, (%)				226.31	<0.001
Yes	2417 (34.2)	707 (51.5)	1710 (30.0)
No	4655 (65.8)	667 (48.5)	3988 (70.0)
Family economic status, (%)				15.05	0.001
Good	1444 (20.4)	264 (19.2)	1180 (20.7)
Fair	4786 (67.7)	905 (65.9)	3881 (68.1)
Poor	842 (11.9)	205 (14.9)	637 (11.2)
Father’s education level, (%)				0.82	0.664
Middle school and below	4827 (68.3)	924 (67.2)	3903 (68.5)
High school	1304 (18.4)	260 (18.9)	1044 (18.3)
College and above	941 (13.3)	190 (13.8)	751 (13.2)
Mother’s education level, (%)				1.80	0.407
Middle school and below	5399 (76.3)	1039 (75.6)	4360 (76.5)
High school	918 (13.0)	193 (14.0)	725 (12.7)
College and above	755 (10.7)	142 (10.3)	613 (10.8)