1. Blood pressure was collected from all patients aged 85 years and olderrecently diagnosed with cardiovascular disease at a hospital serving everyone in a town. Blood pressure was compared with a sample of people of the same age (85+ years) without cardiovascular disease randomly selected from the same town. Which statement about this study is correct?
2. a.This study is not open to confounding
3. b.This is a cohort study
4. c.This study is open to selection bias
5. d.The people is the study were followed up for incidence of cardiovascular disease
6. e.It would have been better to have selected the controls from the hospital in this study