Researchers compared health records for two groups of adults with different alcohol-consumption patterns. The table gives the number of adults in each group and the number who developed liver disease during an 8-year period.
| Group | Number of adults | Number who developed liver disease during the 8-year period |
|---|---|---|
| Regularly consumed large amounts of alcohol | 3000 | 90 |
| Did not regularly consume large amounts of alcohol | 9000 | 36 |
Calculate how many times as likely an adult who regularly consumed large amounts of alcohol was to develop liver disease as an adult who did not regularly consume large amounts of alcohol.
304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.