A 3% margin of error means that if the same procedure is used a large number of times, 95% of the time the true population average will be within the 95% confidence interval of the sample estimate plus or minus 3%.
The latter is a fairly common problem which is associated with people who have the condition known as hypothyroidism. Despite what many people think, tinnitus is actually just a symptom of a larger underlying problem. Hypothyroidism is just one of the many health problems which can cause tinnitus to become a problem. In most cases when the thyroid dysfunction is treated, the tinnitus will resolve itself. There have been some cases of people with this condition who suffer from long-term tinnitus, though that is usually not the case.
Treatments for Hashimoto's Thyroiditis: There is no way to prevent Hashimoto's disease, and there is no cure. However, if Hashimoto's disease results in hypothyroidism, the low levels of thyroid hormone can be replaced to achieve normal levels in the body. To accomplish this, most people with hypothyroidism have to take the oral thyroid hormone replacement medication called levothyroxine for the rest of their lives.