Table 4.

Unstandardized coefficients for the mediation model

		Consequent
		M1 (Optimism)
Antecedent		Coeff.	SE	t	p
X (Coronavirus stress)	a1	−.69	.06	−11.64	<.001
Constant	iM1	34.01	.74	46.27	<.001
R2 = .11 F = 135.40; p < .001
M2 (Social connectedness)
X (Coronavirus stress)	a2	−.89	.08	−10.72	<.001
Constant	iM2	40.55	1.03	39.42	<.001
R2 = .10 F = 114.86; p < .001
Y (COVID-19 burnout)
X (Coronavirus stress)	c’	1.78	.07	26.29	<.001
M1 (Optimism)	b1	−.18	.04	−5.03	<.001
M2 (Social connectedness)	b2	−.10	.03	−3.92	<.001
Constant	iy	19.64	1.45	13.56	<.001
R2 = .51 F = 362.33; p < .001

SE, standard error.; Coeff, unstandardized coefficient; X, independent variable; M, mediator variable; Y, dependent variable