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Table 3 Reliability properties of the BCI (T0, baseline) and FACT-Bl-Cys (T3, 90 days post-operative)

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 Population size (n) Valid population (n)a No. of items per domain Minimal no. of missing items (%)b Maximal no. of missing items (%)c Mean (SD) Median (min-max) Floor effect Ceiling effect Internal consistency (Cronbach’s α)
T0 BCI
 Urinary domain 260 223 12 0 (66%) 12 (3%) 82 (18) 86 (7–100) 0 (0%) 41 (16%) 0.83
  Function 260 241 4 0 (93%) 4 (4%) 85 (25) 100 (0–100) 5 (2%) 144 (55%) 0.86
  Bother 260 212 8 0 (67%) 8 (4%) 79 (21) 84 (11–100) 0 (0%) 48 (19%) 0.82
 Bowel domain 260 239 10 0 (88%) 10 (4%) 87 (15) 92 (34–100) 0 (0%) 40 (15%) 0.83
  Function 260 234 4 0 (90%) 4 (4%) 86 (15) 92 (15–100) 0 (0%) 92 (35%) 0.70
  Bother 260 239 6 0 (90%) 6 (4%) 87 (17) 96 (25–100) 0 (0%) 73 (35%) 0.77
 Sexual domain 260 157 12 0 (42%) 12 (12%) 49 (20) 51 (9–85) 0 (0%) 0 (0%) 0.91
  Function 260 148 7 0 (45%) 7 (12%) 33 (19) 31 (0–82) 5 (2%) 0 (0%) 0.90
  Bother 260 200 5 0 (69%) 5 (15%) 67 (31) 75 (0–100) 5 (2%) 61 (24%) 0.85
T3 FACT-Bl-Cys
 FACT-PWB 182 180 7 0 (91%) 6 (1%) 24 (4) 25 (0–28) 0 (0%) 25 (14%) 0.80
 FACT-SWB 182 177 7 0 (63%) 7 (2%) 21 (4) 22 (0–28) 2 (1%) 11 (6%) 0.81
 FACT-EWB 182 173 6 0 (92%) 6 (4%) 20 (3) 21 (5–24) 0 (0%) 1 (1%) 0.77
 FACT-FWB 182 175 7 0 (90%) 7 (4%) 19 (5) 20 (6–28) 1 (1%) 1 (1%) 0.85
 Bl-Cys domain 182 175 15 0 (63%) 15 (4%) 44 (8) 45 (11–58) 0 (0%) 0 (0%) 0.77
 FACT-Bl-Cys total 182 169 42 129 (18) 132 (74–163) 0 (0%) 0 (0%) 0.90
  1. aThe number of patients that completed enough items to calculate a total score, bMinimal number of missings per domain (i.e. 67% misses 0 items), cMaximal number of missings per domain (i.e. 3% misses 12 items), PWB Physical well-being domain, SWB Social/family well-being domain, EWB Emotional well-being domain, FWB Functional well-being domain, FACT-Bl-Cys total score is only calculated when all items have been completed
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