Table 5.
Correlation of HPV DNA in surgical smoke with the distance of the suction device from the surgical site, operation time and pathological grade
| Factor | HPV infection in surgical smoke | χ2 value | P-value | |
|---|---|---|---|---|
| Positive (Positive rate) | Negative | |||
| Distance of the suction device from the surgical site(cm) | 17.5 | 0.001 | ||
| d<3 | 1 (9.1%) | 10 | ||
| 3≤d≤5 | 9 (15.3%) | 50 | ||
| 6≤d≤7 | 23 (45.1%) | 28 | ||
| d>7 | 7 (53.9%) | 6 | ||
| Surgical time (min) | 1.4 | 0.833 | ||
| 1≤t<2.5 | 0 (0) | 4 | ||
| 2.5≤t<5 | 9 (26.5%) | 25 | ||
| 5≤t<7.5 | 24 (32.9%) | 49 | ||
| 7.5≤t<10 | 3 (30.0%) | 7 | ||
| t≥10 | 4 (30.8%) | 9 | ||
| Cervical pathological grade | 2.3 | 0.489 | ||
| Chronic cervicitis | 0 (0) | 4 | ||
| CIN I | 14 (37.8%) | 23 | ||
| CIN II | 23 (28.0%) | 59 | ||
| CIN III | 3 (27.3%) | 8 | ||
Abbreviations: CIN, cervical intraepithelial neoplasia; d, distance; t, time.