Table 2.
Activ8, mobility level, and walking ability over time. All differences are based on the situation before BAP surgery (T0) and the situation with BAP at the respective follow-up moment (T1, T2, and T3)
| Factor | Preoperative (T0) | 6-months post-operatively (T1) | Median/mean difference T0–T1 (CI) | 12-months post-operatively (T2) | Median/mean difference T0–T2, (CI) | 24-months post-operatively (T3) | Median/mean difference T0–T3, (CI) |
|---|---|---|---|---|---|---|---|
| Activ8 variables, median (Q1 to Q3), h and median difference a | |||||||
| n | 33 | 34 | 41 | 31 | |||
| Active | 1.6 (0.82 to 2.1) | 2.1 (1.4 to 2.5) | 0.35 (0.14 to 0.63) | 2.0 (1.5 to 2.7) | 0.56 (0.27 to 0.97) | 2.7 (2.0 to 3.3) | 0.99 (0.51 to 1.6) |
| Walking | 1.3 (0.79 to 1.9) | 1.8 (1.6 to 2.3) | 0.39 (0.16 to 0.68) | 1.7 (1.2 to 2.4) | 0.54 (0.27 to 0.81) | 2.0 (1.6 to 2.6) | 0.72 (0.29 to 1.2) |
| Cycling | 0.18 (0.14 to 0.31) | 0.17 (0.13 to 0.29) | 0.00 (–0.08 to 0.05) | 0.17 (0.11 to 0.35) | 0.00 (–0.08 to 0.41) | 0.47 (0.18 to 0.65) | 0.28 (0.02 to 0.57) |
| Standing | 2.2 (1.4 to 3.1) | 2.6 (1.8 to 4.1) | 0.01 (–0.53 to 0.64) | 2.5 (1.5 to 4.1) | –0.03 (–0.57 to 0.41) | 2.6 (1.7 to 4.0) | 0.10 (–0.56 to 1.1) |
| Sitting | 12 (11 to 14) | 12 (11 to 14) | –0.30 (–1.3 to 0.79) | 12 (11 to 14) | –0.1 (–0.95 to 0.56) | 11 (9.8 to 13) | –1.1 (–2.4 to 0.43) |
| Lying | 1.1 (0.54 to 3.5) | 2.7 (0.73 to 4.2) | 0.09 (–0.14 to 0.54) | 2.5 (0.69 to 3.9) | 0.09 (–0.11 to 0.47) | 2.7 (1.0 to 5.4) | 0.49 (0.07 to 1.1) |
| Mobility level: median (Q1 to Q3), s and median difference a | |||||||
| n | 38 | 35 | 44 | 32 | |||
| TUG | 12 (9.1 to 14) | 10 (8.3 to 13) | –1.9 (–3.3 to –0.9) | 9.6 (7.6 to 11) | –2.2 (–3.2 to –1.3) | 8.9 (7.7 to 10) | –2.7 (–3.7 to –1.6) |
| Walking ability: mean (SD), m and mean difference b | |||||||
| n | 38 | 35 | 44 | 32 | |||
| 6MWT | 272 (92) | 320 (70) | 56 (34 to 78) | 333 (75) | 60 (41 to 80) | 348 (68) | 81 (53 to 109) |
Wilcoxon test. Non-normal distributed variables are statistically assessed with the Exact Wilcoxon signed rank test with Pratt’s method if there are any zero values, and Hodges–Lehmann medians and exact confidence intervals correspond to the distribution of the differences (location shift).
t-test. Mean difference of paired t-tests is given for normal distributed data with corresponding 95% confidence interval (CI). 6MWT = 6 Minute Walk Test; CI = confidence interval; h, hours; m, meters; NA, not applicable; s, seconds; SD, standard deviation; TUG = Timed Up and Go test.