Assessing self-management in patients with diabetes mellitus type 2 in Germany: validation of a German version of the Summary of Diabetes Self-Care Activities measure (SDSCA-G)

Table 3 Distribution of item scores, item difficulty, item-subscale and item-total correlation and internal consistency in case of deletion

Item	Distribution of item scores^a	Item difficulty^b	Item-subscale-correlation^c	Item-total-correlation^c	α if item deleted
1	4.91 ± 1.904	0.0952	0.510	0.446	0.565
2	4.90 ± 1.786	0.1016	0.532	0.397	0.576
3	4.25 ± 2.252	0.0667	0.310	0.251	0.601
4	4.24 ± 2.066	0.0603	0.112	0.088	0.631
5	4.40 ± 2.373	0.0476	0.336	0.067	0.640
6	1.41 ± 1.987	0.0603	0.336	0.161	0.617
7	2.92 ± 3.055	0.0508	0.899	0.400	0.562
8	2.70 ± 3.029	0.1238	0.899	0.394	0.564
9	3.54 ± 2.725	0.0444	0.440	0.386	0.567
10	1.51 ± 2.306	0.0508	0.440	0.329	0.583

^amean ± standard deviation, ^bdefined as percentage of missings, ^cPearson coefficient, part-whole-corrected.

ISSN: 1477-7525