A small cohort study is conducted in 13 patients with an aggressive cellular disorder linked to cancer.The clinical courses of the patients are depicted graphically below.

1.Compute the prevalence of cancer at 12 months.

Prevalence =(2.5 points)

2.Compute the cumulative incidence of cancer at 12 months.

Cumulative Incidence 12 Months =(2.5 points)

3.Compute the incidence rate (per month) of cancer.

Incidence Rate =per 1,000 person months. (2.5 points)

4.Compute the incidence rate (per month) of death.

Incidence Rate =per 1,000 person months. (2.5 points)