Table 4 Severity score of PPCs
Variables | Non-ONN group(n = 432) | ONN group (n = 461) | χ2 | P-value |
|---|---|---|---|---|
PPCs severity score | 10.635 | 0.020 | ||
Grade 0 | 367(85.0) | 416(90.2) | ||
Grade 1 | 24(5.6) | 9(2.0) | ||
Grade 2 | 32(7.4) | 31(6.7) | ||
Grade 3 | 8(1.9) | 5(1.1) | ||
Grade 4 | 1(0.2) | 0 | ||
Grade 5 | 0 | 0 | ||
PPCs grade ≥ 2 | 41(9.5) | 36(7.8) | 0.800 | 0.405 |
PPCs grade ≥ 3 | 9(2.1) | 5(1.1) | 1.442 | 0.286 |