Study: Philly Lags in Entrepreneurial Spirit?

The Wall Street Journal's Venture Capital Dispatch reports on a Kauffman Foundation study of entrepreneurial activity in the US, that shows Philadelphia lagging way behind among the top 15 metro areas in the country (see Table 11) in terms of the percentage of the adult population starting new businesses.
I'm not sure what this all means; of course, the data includes anything from a home repair business to a one person consulting shop so it is not really a measure of high tech activity. And Seattle and Boston, two areas I would think rank pretty highly, are 14th and tied for 12th respectively in the Kauffman study.