Frequency of usage of the different device sizes
| Variable | Watchman V.2.5 (N=95) | Watchman FLX (N=74) | P value |
| Device size (mm) | 0.09 | ||
| 20/21 | 9 (9.5%) | 4 (5.4%) | |
| 24 | 28 (29.5%) | 25 (33.8%) | |
| 27 | 30 (31.6%) | 16 (21.6%) | |
| 30/31 | 14 (14.7%) | 22 (29.7%) | |
| 33/35 | 14 (14.7%) | 7 (9.5%) | |
| Mean device size (mm) | 26.9±3.6 | 27.6±4.1 | 0.25 |
Similar sizes were combined in one group (20 and 21 mm; 30 and 31 mm; 33 and 35 mm, respectively).