is it possible to reverse calculate male and female proportion from incidence rate?

#1
I got a question to ask about reverse-calculation.

If i have the total number of acral melanoma = 1413
out of the total cutaneous melanomas = 88 8885.

The cohort study went on for 20 years.

the total incidence rate is 1.8 per 100 000 person-years for Acral melanoma
In acral melanoma, incidence rate for males = 1.9 per 100 000 person-years, and for female = 1.8 per 100 000 person-years

1. can i calculate the actual number of males and females who have acral melanoma?

2. If not, am I allowed to extrapolate the ratio of the incidence rates between male and female to the ratio of the actual proportions between the 2 genders?

thank you
 

hlsmith

Not a robit
#2
They don't provide any more decimal places? Are you taking this numbers from a paper, if so please share a link. I didn't follow your second question?