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. Author manuscript; available in PMC: 2013 Jun 27.
Published in final edited form as: Am J Prev Med. 2005 Jan;28(1):109–115. doi: 10.1016/j.amepre.2004.09.013

Figure 1.

Figure 1

Sample size of study population overall and by subgroups, based on weighted data. *Missing data due to “don’t know” or “refused” responses.