The roles of negative mood, impulsivity, and executive dysfunction in non-suicidal self-injury behaviors among Chinese middle school students

Table 2 Hierarchical regression analysis for NSSI thoughts and behaviors among boys (N_boy = 574)

Model	Regression equation		Overall fit index			Significance of regression coefficients
Model		Predictor variable	R	R²	F	β	LLCI	ULCI	t	p
Model 1	NSSI thoughts	Negative mood	0.329	0.108	69.406^***	0.329	0.009	0.015	8.331	< 0.001
Model 2		Negative mood	0.339	0.115	36.979^***	0.293	0.008	0.014	6.800	< 0.001
		Impulsivity				0.088	0.001	0.033	2.042	0.042
Model 3		Negative mood	0.371	0.137	30.286^***	0.166	0.002	0.010	3.083	0.002
		Impulsivity				0.053	-0.006	0.027	1.222	0.222
		Executive dysfunction				0.209	0.006	0.017	3.883	< 0.001
Model 1	NSSI behaviors	Negative mood	0.230	0.053	31.922^***	0.230	0.005	0.009	5.650	< 0.001
Model 2		Negative mood	0.230	0.053	15.936^***	0.229	0.004	0.010	5.125	< 0.001
		Impulsivity				0.003	-0.013	0.014	0.077	0.939
Model 3		Negative mood	0.271	0.074	15.091^***	0.107	0.000	0.007	1.923	0.055
		Impulsivity				-0.030	-0.019	0.009	-0.66	0.509
		Executive dysfunction				0.200	0.004	0.014	3.570	< 0.001

Notes: ^*p < 0.05, ^**p < 0.01, ^***p < 0.001. LLCI represents the lower level of the confidence interval, and ULCI represents the upper level of the confidence interval

ISSN: 2050-7283