Nonprofit sector turnover rates

According to Nonprofit HR Solutions’ 2011 Nonprofit Employment Trends survey, the 456 nonprofits they surveyed reported an average turnover rate of 13% in 2010.  The US Bureau of Labor Statistics reports that the private sector as a whole had about a 2.9% turnover rate.   Assuming these are not apples-to-oranges numbers, then this seems like a pretty troubling picture of the nonprofit sector’s ability to retain its labor force.  Interesting.