Table 6.

Significant variables affecting the WAI based on hierarchical multiple regression analysis

Characteristics	Step 1			Step 2
B	SE	β	B	SE	β
BMI (kg/m2)
≥ 30 versus ≤ 24.9	−2.13	1.07	−0.09∗	−2.0	0.98	−0.09∗
Job tenure (y)
≥ 15 versus ≤ 4.9	−3.22	1.01	−0.17†	−3.07	1.01	−0.16†
Sleep quality
Moderately bad versus good	−3.20	1.15	−0.22†	−2.44	1.07	−0.17∗
Bad versus good	−9.84	1.57	−0.35‡	−7.23	1.47	−0.26‡
Occupational injuries (yes)	−1.58	0.59	−0.12†	–	–	NS
Exercise activity (no)				−1.13	0.52	−0.09∗
Demands				−1.06	0.42	−0.12∗
Managerial support				2.00	0.49	0.26‡
Role				1.58	0.38	0.20‡
r2	0.29			0.42
Adjusted r2	0.25			0.38

BMI, body mass index; NS, not significant; SE, standard error.

B, Unstandardized regression coefficient; β, standardized regression coefficient.

^∗p < 0.05.

^†p < 0.01.

^‡p < 0.001.