Table 4

Factor analysis (followed by Varimax rotation) of the cancer fatigue scale (N=148)

Item	Components
Item	1	2	3
1. Do you become tired easily?	0.913	0.170	0.036
2. Do you have the urge to lie down?	0.777	0.303	0.303
3. Do you feel exhausted?	0.873	0.145	0.230
4. Do you feel you have become careless?	0.495	0.063	0.604
5. Do you feel energetic?	0.426	0.803	0.101
6. Does your body feel heavy and tired?	0.618	0.198	0.420
7. Do you feel that you more often make errors while speaking?	0.066	0.071	0.817
8. Do you feel interest in anything?	0.101	0.919	0.045
9. Do you feel fed-up?	0.412	0.101	0.672
10. Do you feel you have become forgetful?	0.367	−0.303	0.652
11. Can you concentrate on certain things?	0.113	0.861	0.057
12. Do you feel reluctant?	0.825	0.118	0.180
13. Do you feel that your thinking has become slower?	0.111	0.184	0.822
14. Can you encourage yourself to do anything?	0.222	0.890	0.066
15. Do you feel such fatigue that you don't know what to do with yourself?	0.730	0.272	0.366
Eigenvalue*	7.012	2.698	1.435
% Variance explained	46.745	17.986	9.568
Eigenvalue after rotation	4.615	3.436	3.094
% Variance explained after rotation	30.764	22.908	20.627

*Eigenvalue: it is the variance in all the variables, which is accounted for by that factor. A factor's eigenvalue may be computed as the sum of its squared factor loadings for all the variables.62