Morphometric analysis
| Filter pairs (n=15) | Proximal filters (n=15) | Distal filters (n=15) | p* | |
|---|---|---|---|---|
| Total particle count | 123 (21–689) | 78 (9–477) | 39 (3–212) | 0.065 |
| Average minimum particle diameter, µm | 32 (17–62) | 25 (12–68) | 33 (16–77) | 0.165 |
| Average maximum particle diameter, µm | 88 (56–175) | 67 (39–187) | 108 (42–218) | 0.290 |
| Average median particle diameter, µm | 47 (29–95) | 42 (20–120) | 61 (28–124) | 0.237 |
| No. of particles ≥150 µm | 20 (5–140) | 11 (1–100) | 6 (1–45) | 0.237 |
Numbers are median (range). *Proximal vs. distal filters.