| High grade | Mixed grade | Low grade | F | P value | |||
Pregnancy | n | % | N | % | N | % | (7.68)* | (0.02)* |
Negative | 24 | 80 | 28 | 93.3 | 30* | 100 | ||
Positive | 6 | 20 | 2 | 6.7 | (0)* | (0) |