Table 4.

Testing the moderated mediation effect of mobile phone addiction on depression symptoms.

	PSQI				PHQ9
			BOOSTRAP 5000 TIMES 95% CI				BOOSTRAP 5000 TIMES 95% CI
	β	S.E.	LLCI	ULCI	β	S.E.	LLCI	ULCI
Constant	−0.036	1.59	−3.16	3.08	−3.62	2.04	−7.61	0.38
MPAI	0.090***	0.02	0.05	0.13	0.09***	0.01	0.07	0.11
PSQI	–	–	–	–	0.64***	0.04	0.56	0.73
Gender	0.342*	0.17	0.01	0.678	–	–	–	–
MPAI × Gender	−0.01	0.01	−0.04	0.01	–	–	–	–
Age	0.17*	0.08	0.02	0.33	0.17	0.10	−0.03	0.37
Residence	−0.05	0.17	−0.38	0.28	−0.39	0.22	−0.81	0.03
Self-rated health	0.76***	0.11	0.55	0.96	0.75***	0.14	0.48	1.02
			R2 = 0.43				R2 = 0.41
			F = 33.27***				F = 122.25***
	Direct effect of MPAI on PHQ9
			BOOSTRAP 5000 TIMES 95% CI
	β	S.E.	LLCI	ULCI
	0.09***	0.01	0.07	0.11
	Conditional indirect effect at gender values
			BOOSTRAP 5000 TIMES 95% CI
	β	BootS.E.	BootLLCI	BootULCI
M – 1 SD	0.05	0.01	0.04	0.06
M	−0.01	0.01	−0.03	0.01
M + 1 SD	0.04	0.01	0.03	0.05

^*p < 0.05;

^**p < 0.01;

^***p < 0.001.

Variables have been normalized. 95% CI estimated using bootstrap method. Bootstrap sample size = 5,000.

CI, confidence interval; β, standardized regression coefficient; S.E., standard error; LLCI, lower level confidence interval; ULCI, upper level confidence interval; MPAI, mobile phone addiction index; PHQ9, patient health questionnaire-9; PSQI, Pittsburgh Sleep Quality Index.