Residents who did not already have diabetes were again

Question

In a nursing home, a program is launched in 2005 to assess the extent to which its residents are affected by diabetes. Each resident has a blood test and 48 of the 625 residents have diabetes in 2005. Residents who did not already have diabetes were again tested in 2010 and 57 residents had diabetes.

• What is the prevalence of diabetes in 2005?
• Prevalence ₂₀₀₅ = 48/625=0.0768x100 =7.68%
• What is the cumulative incidence of diabetes over 5 years?
• Cumulative Incidence _{5 Years} = 57-48=9/625=0.0144x100=1.44%
• What is the prevalence of diabetes in 2010 (assume that none of the residents in 2005 have died or left the nursing home)?
• Prevalence ₂₀₁₀ = 57/625=0.0912x100=9.12%