Does Low Dose CT screening for lung cancer result in earlier diagnosis of lung cancer?

The question could compare data statistics in the population who have been diagnosed with lung cancer who received screening and those who have not.

The null hypothesis is that populations with a higher screening rate do not have a lower incidence of deaths due to lung cancer.

The alternative hypothesis is that populations with a higher screening rate do have a lower incidence of deaths due to lung cancer.

Key variables

Dependent variable

Cancer stage at diagnosis (stage 1, 2, 3 and 4)

Independent variable

Status of LDCT prior to lung cancer diagnosis

Controlled Variable

Age - 65-77

I need to perform an bi-variate analysis by means of descriptive statistics. Please explain in detail.