Table 4. Item Statistics and Standardized Factor Loadings for the 3D-WFI (Study 2).

Factors	Item Mean	Item SD	Standardized Factor loadings
Physical work fatigue			Model 3a	Model 3b
Item 1	1.97	1.24	.84	.84
Item 2	1.64	1.34	.81	.81
Item 3	2.04	1.29	.90	.90
Item 4	1.57	1.37	.83	.82
Item 5	1.92	1.30	.90	.90
Item 6	1.75	1.35	.83	.82
Mental work fatigue
Item 7	1.86	1.24	.88	.88
Item 8	1.57	1.28	.86	.86
Item 9	1.91	1.28	.93	.93
Item 10	1.49	1.35	.83	.82
Item 11	1.86	1.29	.93	.93
Item 12	1.74	1.35	.83	.82
Emotional work fatigue
Item 13	1.29	1.21	.86	.86
Item 14	1.34	1.25	.93	.93
Item 15	1.33	1.25	.92	.92
Item 16	1.01	1.17	.80	.80
Item 17	1.04	1.20	.87	.87
Item 18	1.23	1.25	.89	.88

Note: N = 2,477. See Appendix for item wording. Item scoring ranged from 0 = never to 4 = everyday. Model 3a and Model 3b represent correlated three-factor solutions without and with the design-based correlated errors, respectively. All factor loadings significant at p< .001.