Development and validation of a prediction model for non-suicidal self-injury in adolescents based on functional near-infrared spectroscopy and neuropsychological assessment

Table 2 Comparison of functional near-infrared spectroscopy indicators between two groups, mean ± SD

Indicator	NSSI group (n = 156)	Control group (n = 156)	t value	P value
Left DLPFC
HbO2 peak (μM)	0.042 ± 0.018	0.068 ± 0.022	-10.82	< 0.001
Activation integral (μM/s)	1.85 ± 0.72	3.12 ± 0.86	-13.68	< 0.001
Activation latency (s)	18.6 ± 5.2	12.5 ± 4.1	11.25	< 0.001
Right DLPFC
HbO2 peak (μM)	0.038 ± 0.016	0.062 ± 0.020	-11.52	< 0.001
Activation integral (μM/s)	1.68 ± 0.65	2.85 ± 0.78	-13.92	< 0.001
Activation latency (s)	19.2 ± 5.5	13.2 ± 4.3	10.56	< 0.001
Left VLPFC
HbO2 peak (μM)	0.035 ± 0.015	0.052 ± 0.018	-8.86	< 0.001
Activation integral (μM/s)	1.52 ± 0.58	2.35 ± 0.68	-11.25	< 0.001
Right VLPFC
HbO2 peak (μM)	0.032 ± 0.014	0.048 ± 0.017	-8.72	< 0.001
Activation integral (μM/s)	1.42 ± 0.55	2.18 ± 0.62	-11.08	< 0.001

DLPFC: Dorsolateral prefrontal cortex; VLPFC: Ventrolateral prefrontal cortex; NSSI: Non-suicidal self-injury; HbO₂: Cortical oxyhemoglobin.