Table 2

Factor analysis of occupational physical activity and psychosocial stressors: variable loading and explained variance related to each factor

O*NET items	Rotated factor loadings*
O*NET items	Factor 1	Factor 2	Factor 3	Factor 4
Occupational physical activity
General physical activities†	0.86	−0.10	−0.19	0.18
Bending or twisting the body	0.84	0.04	0.32	0.01
Standing	0.84	0.09	0.07	−0.23
Handling and moving objects	0.81	−0.26	0.11	0.04
Walking and running	0.80	0.27	0.01	−0.15
Kneeling, crouching or stooping	0.78	−0.22	−0.11	−0.09
Keeping or regaining balance	0.76	0.17	0.22	−0.18
Interpersonal stressor
Dealing with unpleasant or angry people	0.01	0.94	0.14	0.05
Dealing with conflict situations	−0.15	0.85	−0.24	0.21
Dealing with physically aggressive people	0.36	0.71	−0.02	0.18
Resolving conflicts and negotiating with others	−0.34	0.62	−0.37	0.37
Automated work
Making repetitive motions	0.18	−0.05	0.80	−0.21
Pace determined by speed of equipment	0.23	−0.15	0.76	−0.01
Degree of automation	−0.47	0.05	0.68	0.07
Job responsibility
Consequence of error	0.09	0.20	−0.03	0.86
Making decisions and solving problems	−0.40	0.31	−0.33	0.66
Importance of being exact or accurate	−0.39	0.43	0.44	0.51
Proportion of explained variance (%)	35.5	20.1	13.5	6.7
Cumulative explained variance (%)	35.5	55.6	69.2	75.8
Cronbach's α‡	0.92	0.84	0.65	–

*Contribution of Occupational Information Network (O*NET) item to each factor. Bold numbers indicate absolute loadings ≥0.70.
†Performing physical activities that require considerable use of arms and legs and moving the body such as climbing, lifting, balancing, walking, stooping and handling of materials.
^‡Internal consistency among O*NET items with absolute loadings ≥0.70.