While the younger worker seemed to be more at risk, the findings were the same regardless of the status of the worker.

BBC: Stress seems to produce biochemical changes

The status of a worker as an independent contractor or an employee is important for federal income and employment taxes (think IRS and Social Security Administration).

FORBES: 'Tis The Season For Unemployment (Benefits)

If you believe that you have been misclassified as an independent contractor, you can report it to the IRS using a form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding (downloads as a pdf).

FORBES: Ask the taxgirl: Getting Paid Under the Table