Association of parent-child relationship quality and problematic mobile phone use with non-suicidal self-injury among adolescents

Table 4 Additive interaction between mother-child relationship and PMPU with NSSI.

Model	Group		n(%)	β	OR(95%CI)	RERI	AP	SI
Model	MCR	PMPU	n(%)	β	OR(95%CI)	RERI	AP	SI
Crude ^a	High	No	3785(26.1)		1.00
	Low	No	6775(46.7)	0.294	1.342(1.219–1.477)^*
	High	Yes	1258(8.7)	0.634	1.886(1.636–2.174)^*
	Low	Yes	2682(18.5)	0.948	2.579(2.309–2.881)^*	0.354(0.090–0.618)	0.137(0.036–0.238)	1.288(1.042–1.593)
Adjusted ^b	High	No	3785(26.1)		1.00
	Low	No	6775(46.7)	0.366	1.442(1.303–1.596)^*
	High	Yes	1258(8.7)	0.619	1.857(1.607–2.146)^*
	Low	Yes	2682(18.5)	1.009	2.742(2.440–3.081)^*	0.444(0.115–0.772)	0.162(0.049–0.275)	1.342(1.062–1.694)

Note: ^*P < 0.001; MCR = mother-child relationship; PMPU = problematic mobile phone use; NSSI = non-suicidal self-injury. ^a Unadjusted model; ^b Adjusted for sex, boarding school, single child, grade, residency, family economic, parents’ education level, number of friends and father-child relationship.

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