Table 2.

Mediation Analyses

DV	IV	b	SE	t	Bootstrap 95% CI
OCB	Constant	3.09	0.18	17.06***
	Autonomy	0.07	0.03	2.58*
	Engagement	0.35	0.04	10.19***
Engagement	Constant	3.33	0.21	15.75***
	Autonomy	0.29	0.04	7.69***
OCB	Constant	4.26	0.16	26.93***
	Autonomy	0.17	0.03	6.08***
	Indirect Effect 1	0.10	0.02		0.07–0.14
OCB	Constant	2.19	0.23	9.51***
	Optimism	0.38	0.06	6.48***
	Engagement	0.28	0.04	8.12***
Engagement	Constant	1.54	0.34	4.54***
	Optimism	0.78	0.08	10.05***
OCB	Constant	2.62	0.24	10.78***
	Optimism	0.60	0.06	10.67***
	Indirect Effect 2	0.22	0.04		0.15–0.31

Notes: Bootstrap sample size = 5000; *p<0.05; ***p<0.001; indirect effect 1, autonomy→engagement→organizational citizenship behavior; indirect effect 2, optimism→engagement→organizational citizenship behavior.

Abbreviations: DV, dependent variable; IV, independent variable; OCB, organizational citizenship behavior.