This graph shows that women who ran a greater weekly distance were leaner. Fat is distributed differently in men and women. Women tend to accumulate more fat on their thighs and hips and men accumulate more in their gut. Women who ran more miles per week had smaller hips and narrower waists (not shown). Other heart disease risk factors that were significantly improved in association with higher weekly mileage. Higher mileage significantly reduced the ratio of total cholesterol to HDL-cholesterol (sometimes called the risk ratio) and blood pressure (graphs not shown), which are known heart disease risk factors. Fat in the blood is carried principally in the form of triglycerides. Women's triglyceride levels are generally low compared to men. Whereas men's triglycerides tended to decrease substantially in association with the number of miles they ran per week, this was not as true in women (see above graph).