Abstract
The effectiveness of cancer screening is a salient health policy issue that remains unresolved. This article sheds new light on the benefits of population-wide cancer screening. We investigate changes in mortality after the introduction of screening guidelines for breast and prostate cancers in the USA and UK. We use differences in the timing of guideline adoption, differences in ages recommended for screening, and differences in which cancers are detectable by screening to identify the effect of cancer screening guidelines. Our quadruple-differencing strategy finds a moderately sized mortality benefit from mammography and prostate-specific antigen (PSA) screening guidelines among recommended age groups and little change in mortality rates among age groups not recommended to receive screening. As a falsification test, we verify that prostate cancer rates among men did not fall after the introduction of mammography screening and breast cancer rates among women did not fall after the introduction of the PSA test.
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Notes
There may be good reasons why the coefficient estimate for ages not recommended for screening should not be zero, however. On the one hand, if there are spillovers across age groups so that some people who are not recommended for screening get screened, the estimate should be the same sign as the estimate for ages recommended for screening. This will lead to a downward bias in our DDDD estimates. On the other hand, if the introduction of the guideline leads fewer resources to be delivered to ages not recommended for screening, our DDDD estimates are biased upward. The former effect seems more plausible, but both are possibilities.
Both countries used ICD version 7 prior to 1968 and version 8 between 1968 and 1978 before switching to version 9 in 1979. The US switched to version 10 in 1999 while the UK switched in 2001.
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Leive, A., Stratmann, T. Do national cancer screening guidelines reduce mortality?. J Popul Econ 28, 1075–1095 (2015). https://doi.org/10.1007/s00148-014-0536-6
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DOI: https://doi.org/10.1007/s00148-014-0536-6