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Melanoma development on previous nevus distribution in 2020 and before. The Before 2020 absolute frequencies are computed as the averages of the years 2017, 2018 and 2019. P-value results from Chi-squared test.
| Previous nevus | 2020 | Before 2020 | p-value |
|---|---|---|---|
| North | |||
| Absent | 95(44.8%) | 32(58.2%) | 0.106 |
| Present | 117(55.2%) | 23(41.8%) | |
| Center | |||
| Absent | 57(44.2%) | 18(48.6%) | 0.769 |
| Present | 72(55.8%) | 19(51.4%) | |
| South | |||
| Absent | 42(37.2%) | 8(26.7%) | 0.392 |
| Present | 71(62.8%) | 22(73.3%) | |
