Rural versus city living.
Living in the country has a lower risk of developing cancer but higher death rates possibly due to lack of access to treatment according to USA statistics.
S. Jane Henley, MSPH; Robert N. Anderson, PhD; Cheryll C. Thomas, MSPH; Greta M. Massetti, PhD; Brandy Peaker, MD; Lisa C. Richardson, MD. Invasive Cancer Incidence, 2004–2013, and Deaths, 2006–2015, in Nonmetropolitan and Metropolitan Counties — United States. Centers for Disease Control and Prevention. Surveillance Summaries / July 7, 2017 / 66(14);1–13 https://www.cdc.gov/mmwr/volumes/66/ss/ss6614a1.htm?s_cid=ss6614a1_w