Populations that are spread out or defined poorly may skew data in unexpected ways.Iodine Deficiency Disorder (IDD) is combated using an increase in iodine in a persons diet. When a dramatic change occurs in a persons diet, they become more at-risk of developing hypothyroidism and other thyroid disorders. Combatting IDD with high salt intakes should be done carefully and cautiously as risk for Hashimotos may increase. If making modifications to ones diet, it is important to use a clinicians discretion to ensure that the dietary changes are the best option as recommendations can vary person to person. Secular trends
The secular trends of hypothyroidism reveal how the disease has changed over the course of time given changes in technology and treatment options. Even though ultrasound technology and treatment options have improved, the incidence of hypothyroidism has increased according to data focused on the US and Europe. Between 1993 and 2001, per 1000 women, the disease was found varying between 3.9 and 4.89. Between 1994 and 2001, per 1000 men, the disease increased from 0.65 to 1.01.Changes in the definition of hypothyroidism and treatment options modify the incidence and prevalence of the disease overall. Treatment using levothyroxine is individualized, and therefore allows the disease to be more manageable with time but does not work as a cure for the disease.
In humans and other mammals, a leg includes the bones, muscles, tendons, ligaments, blood vessels, nerves, and skin. In insects, the leg includes most of these things, except that insects have an exoskeleton that replaces the function of both the bones and the skin. Sometimes the end of the leg, or foot, is considered part of the leg; other times it is considered separate. Similarly, the hip joint or other place where the leg attaches to the main body may be considered separate or part of the leg. Tetrapod legs
In tetrapod anatomy, leg is used to refer to the entire limb. In human medicine the precise definition refers only to the segment between the knee and the ankle. This lower segment is also called the shank, and the front (anterior) of the segment is called the shin or pretibia. In bipedal tetrapods, the two lower limbs are referred to as the "legs" and the two upper limbs as "arms" or "wings" as the case may be. Human leg

Arthropod leg
Arthropod leg

Robotic leg
A robotic leg is moved by an actuator, which is a type of motor for moving or controlling a mechanism or system. It is operated by a source of energy, usually in the form of an electric current, hydraulic fluid pressure or pneumatic pressure, and converts that energy into some kind of motion. Prosthetic leg
A prosthetic leg is an artificial leg that is used to replace one that has been lost. References
External links
 Media related to Leg at Wikimedia Commons