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.
To accomplish certain written calculations, however, it is useful to represent a percent by a number. And since a percent is how many for each 100 -- 24% is 24 for each 100 -- a percent is a number of hundredths. 24% is 24 hundredths.0% is another way of saying half because 50% means 50 for each 100, which is half. 50% of 12 is 6. A percent means how many for each 100.