This Web Exclusive analyzes the changes in insurance coverage between 2000 and 2004 and finds that the six million increase in the number of uninsured all was among adults. Although both adults and children experienced a 4.6 percentage point drop in the share with employer-sponsored coverage, children were much more likely to obtain public coverage than adults. The analysis also documents that there was a shift from working in industries that historically have had high rates of employer coverage to those with low coverage rates, and from large and medium-sized firms to small firms and self-employment. (Health Affairs Web Exclusive, November 2005)