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

From: 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)

Item Distribution of item scoresa Item difficultyb Item-subscale-correlationc Item-total-correlationc 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
  1. amean ± standard deviation, bdefined as percentage of missings, cPearson coefficient, part-whole-corrected.