Mediator Variable vs Moderator Variable. There is often confusion among students concerning the difference between a mediator variable and a moderator variable. The explanation involves some concepts that haven't been introduced at this point but it can still be worthwhile to discuss these types of variables.n analysis of variance (ANOVA) terms, a moderator effect can be represented as an interaction between a major independent variable and a factor that specifies the appropriate conditions for its operation, that is, the effect of the major independent variable depends upon the value of the moderator variable.
The most common form of myelopathy in human, cervical spondylotic myelopathy (CSM), is caused by arthritic changes (spondylosis) of the cervical spine, which result in narrowing of the spinal canal (spinal stenosis) ultimately causing compression of the spinal cord.
The vast majority of people with lumbar spondylosis do not have symptoms or ever develop complications. Symptoms when they do occur often do not develop until late in life. Symptoms can be due to compression of the spinal nerves (nerve roots), resulting in lower back pain and pain that radiates to the buttocks and legs. Lumbar spondylosis may also lead to abnormal growths (bone spurs) on the vertebrae, spinal osteoarthritis, chronic pain, and disability. There can also be lower back stiffness in the morning.