Table 2.

Results for the hierarchical regression models.

	Mediator		Extra-role performance
Step and variable	β	SE	β	SE
(1) Age	0.04	0.03	-0.03	0.03
Role ambiguity climate	-0.34∗∗∗	0.06	-0.20***	0.05
(2) Age			-0.04	0.03
Role ambiguity climate			-0.09*	0.06
Affective engagement (M)			0.31***	0.03

M, mediator. ^∗p < 0.05; ^∗∗p < 0.01; ^∗∗∗p < 0.001.