Table 4 Number of glass particles by range of their length (n = 19,473)
Group | Length of glass particles (μm) | χ2 | p | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
≤5 | 5–10 | 10–15 | 15–50 | 50–100 | 100–150 | 150–200 | 200–300 | >300 | |||
1 (n = 5169) | 390 (7.5) | 1167 (22.6) | 702 (13.6) | 2732 (52.9) | 153 (3.0) | 17 (0.3) | 3 (0.1) | 3 (0.1) | 2 (0.0) | 91.93 | 0.000 |
2 (n = 5311) | 465 (8.8) | 1191 (22.4) | 741 (14.0) | 2727 (51.3) | 166 (3.1) | 13 (0.2) | 3 (0.1) | 5 (0.1) | 0 (0.0) | ||
3 (n = 4971) | 404 (8.1) | 1109 (22.3) | 724 (14.6) | 2548 (51.3) | 164 (3.3) | 17 (0.3) | 2 (0.0) | 3 (0.1) | 0 (0.0) | ||
4 (n = 4022) | 200 (5.0) | 830 (20.6) | 533 (13.3) | 2278 (56.6) | 164 (4.1) | 15 (0.4) | 2 (0.0) | 0 (0.0) | 0 (0.0) | ||
Total | 1459 (7.5) | 4297 (22.1) | 2700 (13.9) | 10,285 (52.8) | 647 (3.3) | 62 (0.3) | 10 (0.1) | 11 (0.1) | 2 (0.0) | ||