Table 3.

Results from the regression analyses examining the mediator model of the effect of role ambiguity (x) on extra-role performance behavior (y) through leader support (m1) and engagement.

	Coefficient	SE	p
Model 1 (extra-role performance behaviors) Total Effect
X (Role ambiguity)	−0.660	0.067	<0.001
Constant	6.000	0.144	<0.001
R2 = 0.373
F = 95.444, p ≤ 0.001
Model 2 (engagement)
X (Role ambiguity)	−0.988	0.072	<0.001
Constant	6.248	115	<0.001
R2 = 0.370
F = 184.157, p ≤ 0.001
Model 3 (extra-role performance behaviors)
X (Role ambiguity)	−0.405	0.082	<0.001
M1 (Engagement)	0.257	0.050	<0.001
Constant	4.393	0.345	<0.001
R2 = 297
F = 64.552, p ≤ 0.001
Model 4 (leader support)
X (Role ambiguity)	−0.806	0.099	<0.001
Constant	5.526	0.212	<0.001
R2 = 0.173
F = 65.543, p ≤ 0.001
Model 5 (extra-role performance behaviors)
X (Role ambiguity)	−0.445	0.068	<0.001
M2 (Leader support)	0.266	0.035	<0.001
Constant	4.531	0.236	<0.001
R2 = 0.351
F = 84.660, p ≤ 0.001
Model 6 (extra-role performance behaviors)
X (Role ambiguity)	−0.311	0.078	<0.001
M1 (Engagement)	0.165	0.049	<0.001
M2 (Leader support)	0.231	0.036	<0.001
Constant	3.694	0.343	<0.001
R2 = 0.151
F = 61.195, p ≤ 0.001