In Reply: Mr Holstein and Dr Lundberg argue that our sample is likely to be biased, leading us to understate the prevalence of Internet use for health. We believe our sample is representative. We conducted a number of direct comparisons of our sample with recognized benchmarks and found results consistent with the validity of the sample. Additional work by Knowledge Networks also supports the validity of the panel for supporting the kinds of analyses we conducted.1
Baker L, Wagner TH, Bundorf MK, Singer S. Use of the Internet for Health Information and Communication—Reply. JAMA. 2003;290(17):2257–2258. doi:10.1001/jama.290.17.2257a
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