Problem
In January 2011, 4,500 men aged 45-54 years joined a new health insurance plan and were offered a free health check, 1000 of the men were found to be overweight or obese. Ten years later the men were checked again and 700 men who were normal weight in 2011 were now overweight or obese, while 200 of those who were overweight or obese in 2011 had lost weight and were now in the normal range.
A. What was the prevalence of overweight and obesity in the men in (a) January 2011 and (b) January 2021?
B. What was the incidence of overweight/obesity in this group?
C. What was the incidence of weight-loss among overweight/obese men?