Macular thickness, as measured by OCT, is one of the key outcome measures used in most clinical trials, especially those on diabetic macular edema and AMD. Because Stratus TD-OCT was the most common commercially available OCT instrument in the past decade, most trials are designed based on Stratus OCT.
A percentile (or a centile) is a measure used in statistics indicating the value below which a given percentage of observations in a group of observations fall. For example, the 20th percentile is the value (or score) below which 20% of the observations may be found. The term percentile and the related term percentile rank are often used in the reporting of scores from norm-referenced tests.
The percent is. always over 100 because thatâs what percent means. The âpart over wholeâ is the. definition of a fraction. In this case, the number following âofâ is the whole. The advantage to the proportion method is that we never have to worry. about moving decimal points in our percents. The division by 100 takes care of. that for us.