Table 3.
Amount of physical activity and proportion of sedentary activity recorded preoperatively and at 6 months postoperatively, reported as median (interquartile range)
| Physical activity | Number of participants | Preoperatively | 6 months postoperatively | p value | |
|---|---|---|---|---|---|
| Amount of activity | Method 1: average accelerometer activity counts (cpm) | Total (n = 44) | 149 (133) | 161 (86) | 0.12 |
| THA (n = 19) | 125 (107) | 109 (166) | 0.63 | ||
| TKA (n = 25) | 183 (143) | 159 (89) | 0.06 | ||
| Method 2: Average accelerometer activity counts (cpm) | Total (n = 44) | 96 (73) | 93 (72) | 0.13 | |
| THA (n = 19) | 76 (74) | 63 (93) | 0.79 | ||
| TKA (n = 25) | 104 (61) | 98 (57) | 0.07 | ||
| Intensity of activity | Proportion of time engaged in sedentary activity* (%) | Total (n = 44) | 82 (7.8) | 83 (8.2) | 0.11 |
| THA (n = 19) | 84 (9.8) | 86 (10) | 0.33 | ||
| TKA (n = 25) | 82 (7.1) | 83 (7.9) | 0.17 |
* Sedentary intensity is defined as < 100 activity counts per minute [19, 44]. A p value < 0.05 was considered statistically significant; Method 1 = activity counts calculated using wear hours only on valid days; Method 2 = activity counts calculated inclusive of wear hours and nonwear hours on valid days; cpm = counts per minute.