A long-term study investigated the relative risk of developing a non-communicable liver disease based on weekly alcohol consumption (measured in units per week) for two groups of adults:
- Group X (solid line): Sedentary lifestyle (low physical activity)
- Group Y (dashed line): Active lifestyle (high physical activity)
A relative risk of 1.0 represents the baseline risk of the reference group.
An individual in Group X consumes 15 units15\text{ units}15 units of alcohol per week. If they increase their physical activity levels to join Group Y while maintaining their alcohol intake at 15 units15\text{ units}15 units per week, calculate the percentage decrease in their relative risk of developing liver disease. Give your answer to one decimal place.
A standard pint of lager contains 2.5 units2.5\text{ units}2.5 units of alcohol. An individual in Group Y drinks 101010 pints of lager each week and consumes no other alcohol. Calculate their total weekly alcohol consumption and use the graph to find their relative risk of developing liver disease.