Better measures of the distribution of scores are the variance and standard deviation. The variance (2) is the sum of the squares of the deviations of the individual test scores (xi) from the mean () divided by the number of scores (n). The standard deviation () is the square root of the variance.
Reducing triglyceride levels is one of the main mechanisms by which fish oil omega-3 fatty acids improve cardiovascular health. With regards to cholesterol, fish oil omega-3 fatty acids can increase the level of âgoodâ cholesterol while lowering âbadâ cholesterol. However, this relationship is not straightforward. In fact, fish oil can raise LDL cholesterol in people with high blood triglyceride levels.
In addition to vitamins, we hear recommendations for all kinds of other diet supplements. Thereâs no good evidence for most of them. For fish oil, one of the most popular supplements, the evidence boils down to this: (1) In patients who have had a heart attack, fish oil improves survival. (2) It reduces triglycerides. (3) In patients with high cholesterol levels it reduces the risk of coronary events but does not decrease mortality. (4) It reduces blood pressure slightly.