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

Table 5 Additive interaction between mother-son 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	2019(27.5)		1.00
	Low	No	3291(44.8)	0.287	1.333(1.170–1.518)^*
	High	Yes	650(8.8)	0.403	1.496(1.226–1.825)^*
	Low	Yes	1387(18.9)	0.885	2.423(2.085–2.817)^*	0.594(0.225–0.964)	0.245(0.104–0.386)	1.717(1.144–2.577)
Adjusted ^b	High	No	2019(27.5)		1.00
	Low	No	3291(44.8)	0.357	1.429(1.247–1.639)^*
	High	Yes	650(8.8)	0.383	1.466(1.199–1.793)^*
	Low	Yes	1387(18.9)	0.933	2.542(2.170–2.978)^*	0.646(0.219–1.074)	0.254(0.103–0.406)	1.722(1.136–2.609)

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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