Bedtime procrastination related to loneliness among Chinese university students during post-pandemic period: a moderated chain mediation model

Table 2 Test for the chain mediation model

Regression equation		Overall fit indices			Significance of regression coefficients
Result Variables	Predictive variables	R	R²	F	β	95%CI	t
Bedtime procrastination	Loneliness	0.52	0.27	62.20^***	0.50	[0.44,0.55]	16.78^***
Risk perception of COVID-19	Loneliness	0.35	0.13	24.31^***	0.11	[0.04,0.17]	3.32^***
Self-regulatory fatigue	Loneliness	0.77	0.59	204.46^***	0.74	[0.70,0.79]	33.44^***
Self-regulatory fatigue	Risk perception of COVID-19				0.10	[0.06,0.15]	4.46^***
Bedtime procrastination	Loneliness	0.60	0.36	67.32^***	0.16	[0.08,0.25]	3.86^***
	Risk perception of COVID-19				0.09	[0.03,0.14]	2.85^**
	Self-regulatory fatigue				0.43	[0.34,0.51]	9.92^***

N = 855, ^*p < 0.05, ^**p < 0.01,^***p < 0.001. In addition to age and gender, the presence or absence of COVID-19 infection in oneself, loved ones, and friends over the last three months were also included as a control variable in the model. The study variables were standardized

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