Problem: Now we tell you that some of the 500 participants died or left the above study during the 10 years of the study. Table 2 shows the total number of person-years of follow-up by alcohol-use status. Table 2. Follow-up time by alcohol use Alcohol Use Developed Liver disease Total Follow-up (person years) Alcohol Users 175 755 Non-alcohol users 30 225 Total 205 980 Question: What is the incidence rate of developing liver disease in alcohol users? Report your answer per 1000 person-years.