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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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