| |
Data quality
|
Scaling assumptions
|
Targeting
|
Reliability
|
Item convergent – discriminant validity: ITC range
|
|---|
| |
Missing data %
|
Possible range (mid- point)
|
Actual score range
|
Mean (SD)
|
CITC range
|
Floor effect %
|
Ceiling effect %
|
Skewn.
|
Cronbach’s alpha
|
IIC mean
|
1
|
2
|
3
|
4
|
5
|
|---|
|
Symptoms & flares
|
7.52
|
14–56 (35)
|
14–56
|
35.29 (7.99)
|
0.44–0.69
|
0.72
|
0.72
|
−0.35
|
0.90
|
0.40
|
0.54–0.73
|
0.05–0.20
|
0.12–0.34
|
0.16–0.45
|
0.02–0.25
|
|
Medication
|
4.30
|
11–40 (27.50)
|
11–44
|
30.96 (6.77)
|
−0.35–0.71
|
0.72
|
3.94
|
−0.15
|
0.90
|
0.60
|
0.02–0.18
|
0.46–0.77
|
0.23–0.40
|
0.25–0.33
|
0.04–0.43
|
|
Trust in doctor
|
2.15
|
8–32 (20)
|
8–32
|
22.37 (4.90)
|
0.40–0.71
|
0.72
|
1.43
|
−0.24
|
0.86
|
0.61
|
0.32–0.14
|
0.23–0.49
|
0.56–0.78
|
0.39–0.20
|
0.24–0.49
|
|
Self-management
|
3.58
|
6–24 (15)
|
6–24
|
18.80 (3.68)
|
0.53–0.67
|
0.72
|
8.60
|
−0.61
|
0.82
|
0.60
|
0.18–0.48
|
0.19–0.44
|
0.26–0.40
|
0.67–0.78
|
0.04–0.21
|
|
Impact
|
2.51
|
10–40 (25)
|
10–40
|
24.95 (8.15)
|
0.39–0.79
|
1.43
|
0.36
|
−0.13
|
0.93
|
0.73
|
0.00–0.24
|
0.11–0.42
|
0.20–0.43
|
0.04–0.29
|
0.49–0.84
|
-
CITC corrected item total correlation, Skewn skewness statistic, IIC item-item correlation, ITC item total correlation
