You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is "Goitre is prevalent in high altitudes"- is an example of: and explain in detail?
The indirect association is an association between a characteristic (or variable) of interest and a disease due to the presence of another factor, known or unknown that is common to both the characteristic and the disease. This common factor is also known as the "confounding" variable. In the above example iodine deficiency is the confounding variable. High altitude Iodine deficiency Goitre prevalence Ref: Park 21st edition, page 85.