Ultrasound (US) procedures are diagnostic, noninvasive, and relatively inexpensive. They take a short time to complete, do not use radiation, and cause no harm to the patient. High-frequency sound waves of various intensities are delivered by a transducer, a flashlight-shaped device, pressed against the skin.
According to the BLS current population survey (CPS), the unemployment rate for California rose 0.1 percentage points in July 2017 to 4.8%. The state unemployment rate was 0.5 percentage points higher than the national rate for the month. The unemployment rate in California peaked in February 2010 at 12.2% and is now 7.4 percentage points lower. From a post peak low of 4.7% in May 2017, the unemployment rate has now grown by 0.1 percentage points. You can also see California unemployment compared to other states.
It depends on a number of factors. In order of importance, they are the industry, the state, and the businesses' claims experience. (Other factors apply as well). In California, the average cost of workers' compensation is about 2.5% of payroll in 2013. This was down from the crisis years of 2001-2003 when it peaked at more than 6% of payroll. If you break this out by industry, you'll see huge differences.