1. The standard for leg length is not determined solely by the absolute length of the legs, but rather by the proportion of the body.2. A common method for measurement is the truncated leg length index, which reflects the ratio of standing height to sitting height.3. The formula for calculating the truncated leg length index is: (Standing height - Sitting height) / Sitting height * 100%, measured in centimeters.4. Based on different ranges of the truncated leg length index, leg types can be categorized as extra-long, long, sub-long, medium, sub-short, and short.5. Body proportion is not directly proportional to height; taller women tend to have longer legs, while shorter men tend to have shorter legs.6. In the Chinese population aged 22-25, 0.4% have extra-short legs, 5.9% have short legs, 33.6% have sub-short legs, 42.9% have medium legs, 15.8% have sub-long legs, 1.3% have long legs, and 0.2% have extra-long legs.7. This means that the majority of people have medium-length legs, while extra-long legs are quite rare.8. The classification of legs as long or short is based on body proportion rather than length alone, which is crucial when assessing leg length.