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Table 2 SCI-R: mean (SD), exploratory factor analysis, acceptability, internal consistency reliability (of uni-dimensional Model 2 (13 items excluding 3 & 13)), and interpretability

From: Psychometric validation of the Self-Care Inventory-Revised (SCI-R) in UK adults with type 2 diabetes using data from the AT.LANTUS Follow-on study

SCI-R items    Exploratory factor analysis Acceptability Reliability Interpretability
  Mean (standard deviation) Forced one-factor solution 1 Forced one-factor solution 1(excluding item 13) Completion rate N = 353 n (%) % floor % ceiling Alpha Item-total correlations MID MCID
1. Check blood glucose with monitor 4.26 (0.94) 0.55 0.55 350 (99.2) 1.4 53.3 .75 .46 0.26 – 0.47 0.38
2. Record blood glucose 3.86 (1.32) 0.45 0.45 343 (97.2) 8.2 45.3 .76 .35 0.34 – 0.66 0.34
3. Check ketones a 2.40 (1.68) - - 121 (34.2) - - - - - -
4. Correct dosage of pills/insulin 4.81 0.57 0.52 0.54 343 (97.2) 1.1 82.7 .76 .36 0.07 – 0.28 0.05
5. Take pills/insulin at correct time 4.60 0.63 0.55 0.56 348 (98.6) 0.8 64.0 .76 .38 0.19 – 0.31 0.19
6. Correct food portions 3.77 0.80 0.66 0.67 349 (98.9) 1.7 15.3 .75 .51 0.39 – 0.40 0.08
7. Meals/snacks eaten on time 3.92 0.83 0.69 0.69 348 (98.6) 1.7 22.1 .74 .53 0.29 – 0.42 0.31
8. Keep food records 1.59 0.99 0.39 0.39 346 (98.0) 62.9 3.7 .76 .31 0.20 – 0.49 0.05
9. Read food labels 3.12 1.37 0.49 0.49 347 (98.3) 18.7 19.0 .76 .38 0.32 – 0.69 0.14
10. Recommended carbohydrates 3.57 1.24 0.54 0.54 302 (85.6) 8.5 21.0 .75 .44 0.52 – 0.62 0.26
11. Carry quick acting sugar 3.78 1.48 0.54 0.53 347 (98.3) 15.3 46.7 .75 .43 0.25 – 0.74 0.26
12. Attend clinic appointments 4.86 0.48 0.57 0.57 347 (98.3) 0.6 87.8 .76 .42 0.10 – 0.24 0.13
13. Wear medic alert 2.15 1.71 0.25 - 348 (98.6) 65.4 22.1 - - 0.15 – 0.85 0.14
14. Exercise 3.35 1.09 0.52 0.52 349 (98.9) 5.4 17.0 .75 .40 0.26 – 0.54 0.08
15. Adjust insulin dosage 3.38 1.42 0.42 0.42 338 (95.8) 17.0 24.9 .76 .35 0.06 – 0.71 0.04
SCI-R Total Score b 69.00 12.82    348 (98.6) - - .77 - 6.50 – 7.0 4.00
  1. aAs so few respondents completed item 3, this item was excluded from the overall analyses.
  2. bSCI-R Total Score = sum of 13 items (excluding items 3 and 13).
  3. MID: minimal important difference; MCID: minimal clinically important difference.
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