People with OCD may be obsessed with cleanliness, but this is just one area in which OCD can be focused. According to Foa and Kozak (1995), in their study tracking OCD prevalence, cleaning compulsions are present for about 27 percent of individuals with OCD, and fear of contamination, which is often related to cleaning, is present in about 38 percent of individuals with OCD. Cleanliness may represent several things to people with OCD. Obviously, it may be a physical cue that there are no germs in the vicinity, which may be relieving to them. Without any visible soiling or mess, they may feel that there is nothing in the room that can harm them. Cleanliness may also represent order, and order is often related to control. As long as their possessions are in order, they may feel in control of their environment. Finally, cleanliness may represent avoidance. Some people may clean a room and then never step foot in it again. It may have taken them so long to get the room “just right” that they do not want to risk having to go through all of that cleaning and straightening again, so it becomes something like a museum, only to be admired and never to be used.