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