Table 2.

Factor Loadings of SPOC Items on 4 Factors

	Component
Questionnaire Item	1	2	3	4
Somatic complaints
Muscles hurt after exercise	.744
Muscles hurt at rest	.719
Experienced pain in the last week	.707
Experienced stiff joints in the past week	.674
Experienced heavy feelings in arms or legs in the past week	.580
Experienced problems with sleep in the past week	.558
Experienced loss of strength in the past week	.532		.404
Experienced balance problems in the past week	.513
Felt lower back pain in the past week	.476
Feeling weak in the past week	.458		.455
Coping
Lost sleep over worry in the past week		.713
Thinking of yourself as a worthless person in the past week		.680
Felt you couldn’t overcome your difficulties in the past week		.613
Experienced hot or cold spells in the past week		.585
Felt under constant strain in the past week		.585
Feeling reasonably happy in the past week		.553
Energy
Difficulty concentrating			.668
Poor memory			.631
Feeling low in energy or slowed down in the past week			.551
Problems starting things	.410		.506
Less strength in your muscles			.496
Need to rest more			.465
Experienced fatigue in the past week			.427
Optimism
My treatment will be effective in curing my injury				.732
The symptoms due to my injury will improve with time				.675
There is a lot that I can do to control my injury-related symptoms				.632
The symptoms due to my injury will last a short time				.619