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Table 6 Test-retest properties of the BCI and FACT-Bl-Cys (T3 and T3 retest)

From: Translation and validation of two disease-specific patient-reported outcome measures (Bladder Cancer Index and FACT-Bl-Cys) in Dutch bladder cancer patients

Domains Valid population (n) No. of items per domain T3 Mean (SD) T3 Median (min-max) T3 retest Mean (SD) T3 retest Median (min-max) T3-T3 retest T3 retest:a ICCagreement (95% CI) Measurement error:b SEMagreement Measurement error:c SDCindividual Measurement error:d SDCgroup
Mean change (SD) 95% CI SE
BCI
 Urinary domain 53 12 84 (17) 91 (32–100) 86 (15) 92 (31–100) −2 (7) −25; 15 0.9 0.90 (0.83; 0.91) 4.98 13.82 1.90
  Function 43 4 76 (33) 100 (0–100) 83 (28) 100 (0–100) −7 (16) −57; 8 2.4 0.85 (0.71; 0.92) 12.16 33.72 5.14
  Bother 52 8 88 (12) 91 (50–100) 88 (14) 92 (47–100) 0 (9) −17; 36 1.2 0.77 (0.63; 0.86) 6.13 16.99 2.36
 Bowel domain 61 10 84 (14) 88 (37–100) 86 (14) 90 (47–100) −2 (10) −26; 26 1.3 0.76 (0.63; 0.85) 7.05 19.54 2.50
  Function 57 4 85 (17) 92 (36–100) 87 (14) 92 (42–100) −2 (11) −33; 29 1.5 0.74 (0.60; 0.84) 7.80 21.63 2.86
  Bother 61 6 83 (16) 88 (33–100) 85 (16) 92 (38–100) −2 (11) −29; 26 1.4 0.76 (0.63; 0.85) 7.98 22.12 2.83
 Sexual domain 19 12 40 (16) 42 (3–65) 38 (17) 35 (8–69) 2 (11) −11; 26 2.5 0.78 (0.53; 0.91) 7.55 20.92 4.80
  Function 14 7 26 (16) 29 (0–48) 29 (16) 29 (4–54) −3 (5) −14; 8 1.4 0.93 (0.79; 0.98) 4.17 11.56 3.09
  Bother 42 5 62 (28) 60 (6–100) 55 (26) 50 (13–100) 7 (28) −59; 80 4.3 0.47 (0.20; 0.67) 20.07 55.63 8.58
FACT-Bl-Cys
 FACT-PWB 58 7 25 (4) 26 (13–28) 25 (3) 26 (16–28) 0 (2) −7; 8 0.3 0.74 (0.59; 0.83) 1.76 4.88 0.64
 FACT-SWB 57 7 22 (4) 22 (0–28) 22 (3) 23 (13–28) −1 (4) − 19; 5 0.6 0.43 (0.19; 0.62) 3.01 8.34 1.10
 FACT-EWB 54 6 21 (3) 21 (11–24) 21 (3) 22 (12–24) 0 (2) −4; 7 0.3 0.72 (0.56; 0.83) 1.57 4.36 0.59
 FACT-FWB 54 7 20 (5) 21 (6–28) 20 (5) 22 (9–28) −1 (3) −8; 8 0.5 0.78 (0.64; 0.86) 2.35 6.52 0.89
 Bl-Cys domain 54 15 45 (7) 44 (24–57) 46 (8) 47 (20–59) 0 (4) −10; 13 0.6 0.82 (0.71; 0.89) 3.14 8.69 1.18
EQ-5D-5 L
 5D-5 L 55 5 0.87 (0.1) 0.91 (0.49–0.95) 0.85 (0.1) 0.88 (0.54–0.95) 0 (0.1) −0.1;0.2 0.01 0.82 (0.71; 0.89) 0.05 0.13 0.02
 EQ-VAS 62 1 75 (22) 81 (0–100) 73 (26) 81 (0–100) 2 (30) −85;87 4 0.23 (−0.26; 0.45) 21.21 58.79 7.47
  1. aICC Intraclass Correlation Coefficient (two-way random effects model, absolute agreement, single measures); bSEM Standard Error of Measurement (√(σ2o + σ2residual)); cSDCindividual Smallest Detectable Change on individual level (=1.96*√ (2)*SEM); dSDCgroup Smallest Detectable Change on group level, i.e. the smallest difference in score that can be distinguished from measurement errors (=SDCindividual/√(n))
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