Development and validation of the insulin treatment appraisal scale (ITAS) in patients with type 2 diabetes

Table 2 Exploratory factor analyses of the 20 items of the ITAS: forced 2-, 3- and 4-factor solution after Oblimin rotation. Only factor loading > 0.40 are shown; h²: communality.

	2-factor solution:			3-factor solution				4-factor solution
	h ²	F1/2	F2/2	h ²	F1/3	F2/3	F3/3	h ²	F1/4	F2/4	F3/4	F4/4
Item content:
1. Failed on pre-insulin therapy	0.34	0.59		0.53	0.45		0.67		0.71		0.82
2. Diabetes has gotten worse	0.50	0.70		0.63	0.57		0.70		0.74	0.45	0.86
3. Prevent complications	0.49		0.70	0.53		0.72		0.53		0.72
4. Perceived by others as more sick	0.51	0.71		0.57	0.61		0.62		0.60	0.52	0.75
5. Life less flexible	0.51	0.70		0.51	0.60		0.44			0.60		0.64
6. Fear of injecting with needle	0.40	0.62		0.52	0.70				0.52	0.70
7. Risk of hypoglycaemia	0.28	0.52		0.28	0.48				0.39	0.50		0.44
8. Improves health	0.59		0.77	0.64		0.79		0.65		0.79
9. Causes weight gain	0.03	-	-	0.33			0.60	0.80			0.88
10. Takes time and energy	0.50	0.70		0.58	0.74				0.58	0.74	0.46
11. Give up activities I enjoy	0.58	0.70		0.58	0.68				0.58	0.65	0.57
12. My health will deteriorate	0.56	0.71		0.58	0.66		0.49		0.62	0.64	0.57	0.41
13. Injecting is embarrassing	0.53	0.70		0.57	0.73				0.57	0.72	0.49
14. Injecting is painful	0.41	0.64		0.55	0.72				0.61	0.76
15. Difficult to always inject correctly	0.49	0.70		0.58	0.76				0.59	0.77	0.41
16. Difficult to fulfil responsibilities	0.67	0.80		0.71	0.82				0.71	0.81	0.56
17. Helps to control blood glucose	0.55		0.74	0.56		0.73		0.56		0.72
18. Family/friends more concerned	0.39	0.59		0.44	0.49		0.56		0.46	0.45	0.55	0.44
19. Helps to improve energy levels	0.28		0.53	0.28		0.53		0.29		0.53
20. More dependent on doctor	0.47	0.67		0.48	0.62		0.47		0.49	0.56	0.63
Explained variance:	45%			52%				57%

ISSN: 1477-7525