As of last June ADP had debt service coverage of 275 times.

FORBES: Standard and Poor's Lack Of Integrity Will Be Exposed

One of the biggest statistics to focus on is debt service coverage.

FORBES: Standard and Poor's Lack Of Integrity Will Be Exposed

Based on preliminary Sageworks estimates for 2012, debt-service coverage for the average private company is more than five times.

FORBES: Two signs private companies are stronger

Debt-service coverage is defined as EBITDA, or earnings before interest, taxes, depreciation and amortization, relative to the current portion of long-term debt and interest.

FORBES: Two signs private companies are stronger