The index's survey found that 41% of workers believed the economy was getting weaker in August, up from 39% in July. However, 10% believed more jobs were available in August, up from 8% in July.

"Despite nominal movement in our latest employee confidence index, there was quite a bit of good news inside our latest report," said SFN President and CEO Roy Krause. "Not only are workers feeling more secure in their current positions, but they are also feeling slightly more optimistic about the future of their current employers. While recent economic figures show a mixed bag, we need to look at the bigger picture. Looking back to where we were as a nation one year ago, things have improved significantly. Given the current trends within our recruiting and staffing business, we are continuing to see solid growth for temporary help services."

The index's survey questioned 1,087 employed adults in the U.S.