The total of both variances equals the total direct materials variance. To apply this method to the Band Book example, take a look at the next diagram. Start at the bottom. Direct materials actually cost $297,000, even though the standard cost of the direct materials is only $289,800.
These factors can all reduce the space around a nerve root in the lower back, interfering with nerve function. Symptoms of sciatica may include pain, weakness, numbness or tingling in the low back, buttocks, posterior thighs, legs and feet. Symptoms often occur only on one side of the body.
If the sciatic nerve is irritated, then these sensory fibres can get involved and can't do their job properly. This leads to the changes in feeling that happen with a pinched nerve. Aside from severe pain (which is a very nasty change in feeling) the other very common symptoms of sciatica are numbness and tingling in the feet and legs. If the nerve is particularly irritated and the motor fibres are involved you can have tingling, numbness and weakness in the legs.