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Table 2 Item correlations within and between scales of the EORTC QLQ-BLM30 at baseline (T6wk), 6 months, 12 months and 24 months

From: Validation and reliability of the Dutch version of the EORTC QLQ-BLM30 module for assessing the health-related quality of life of patients with muscle invasive bladder cancer

Scale

Baseline (n=650)

6-mo follow-up (n=396)

12-mo follow-up (n=357)

24-mo follow-up (n=277)

 

Con

Dis

α

%Floor

%Ceiling

Con

Dis

α

%Floor

%Ceiling

Con

Dis

α

%Floor

%Ceiling

Con

Dis

α

%Floor

%Ceiling

USa

0.51 to 0.72

-0.17 to 0.29

0.87

42.7%

0.9%

0.55 to 0.77

-0.19 to 0.38

0.89

45.0%

0.5%

0.64 to 0.77

-0.26 to 0.44

0.90

50.0%

0.0%

0.41 to 0.78

-0.51 to 0.59

0.87

48.3%

0.0%

UPb

0.34 to 0.39

-0.16 to 0.33

0.58

53.1%

0.8%

0.33 to 0.39

-0.17 to 0.19

0.60

40.3%

0.8%

0.41 to 0.46

-0.19 to 0.24

0.65

45.6%

0.6%

0.21 to 0.49

-0.11 to 0.31

0.55

44.6%

0.4%

FW

0.77 to 0.82

-0.03 to 0.38

0.89

7.8%

5.2%

0.75 to 0.82

-0.17 to 0.38

0.89

21.4%

1.0%

0.70 to 0.80

-0.35 to 0.45

0.87

26.7%

0.3%

0.79 to 0.82

-0.22 to 0.48

0.90

35.8%

0.8%

BAF

0.37 to 0.37

-0.12 to 0.28

0.54

55.6%

0.0%

0.37 to 0.37

-0.08 to 0.34

0.54

51.6%

0.0%

0.37 to 0.37

-0.17 to 0.36

0.54

46.0%

0.4%

0.32 to 0.32

-0.16 to 0.54

0.48

46.1%

0.0%

BI

0.54 to 0.67

-0.08 to 0.42

0.78

39.8%

17.0%

0.57 to 0.70

-0.08 to 0.31

0.78

30.5%

30.5%

0.61 to 0.70

-0.18 to 0.44

0.80

33.3%

25.8%

0.60 to 0.69

-0.11 to 0.47

0.80

31.1%

27.7%

SX

0.70 to 0.70

-0.17 to 0.03

0.82

11.4%

0.0%

0.60 to 0.60

-0.20 to -0.01

0.75

39.6%

0.5%

0.64 to 0.64

-0.31 to 0.04

0.78

51.0%

0.0%

0.66 to 0.66

-0.46 to 0.00

0.79

55.5%

0.0%

SXmen

0.77 to 0.77

-0.16 to 0.18

0.87

7.1%

0.4%

0.64 to 0.64

-0.12 to 0.27

0.78

6.8%

0.0%

0.65 to 0.65

-0.13 to 0.27

0.79

12.7%

0.6%

0.70 to 0.70

-0.16 to 0.21

0.82

17.8%

0.0%

  1. α Cronbach α coefficient, BAF Bloating and flatulence, BI Body image, Con Range of item-scale correlations (corrected for overlap), Dis Range of correlations between an item and another scale, FW Future worries, SX Sexual functioning, SXmen Sexual problems in men, UP Urostomyproblems, US Urinary symptoms
  2. a Results are based on 546 (T6wk), 206 (T6mo), 158 (T12mo) and 107 (T24mo) patients
  3. b Results are based on 88 (T6wk), 182 (T6mo), 192 (T12mo) and 164 (T24mo) patients