Stephen J.LurieMD, PhD, Senior Editor
In Reply: Dr Henzlova raises the issue of potential sampling bias following events that involve substantial infrastructure damage. The impact of such damage on sampling in our study was minimal, as participants in our study were selected from a panel that was recruited before the attacks. Nevertheless, infrastructure damage could have kept sample members who lived in the areas most affected from responding. Although we cannot tell from our data whether nonreponse in our New York City sample is related to distance from the World Trade Center, it is reassuring that the response rate for the New York City sample (70%) was identical to that in our oversample of other major metropolitan areas. This suggests that infrastructure damage was probably not an important source of response bias in our study.
Schlenger WE, Caddell JM, Ebert L, Jordan BK, Batts KR. Psychiatric Consequences of September 11—Reply. JAMA. 2002;288(21):2684. doi:10.1001/jama.288.21.2684-JLT1204-1-5