Health care service providers likely saw weak demand in the final quarter of 2012, but that may have limited impact on their shares. Investors are focused on longer-term gains from the national health care overhaul, according to a Jefferies analyst.

The Senate took up the Violence Against Women Act Monday, seeking to remedy Congress' failure last year to extend and expand a law protecting women from domestic abuse while broadening its coverage to include Native Americans, gays and lesbians.

Among eligible part-time workers, fewer elect health care benefits at large companies in comparison to full-time employees.