Cox proportional hazard regression model of Overall Survival.

Table 3.a Adjusted by Cox proportional hazards models including all factors, as categorized in
b Including American Indian/AK Native, Asian/Pacific Islander.
c Including divorced, widowed, single (never married),separated.
% of individuals having over a 12th grade education level; Low indicates a county with less than 78.0% (including 78.0%) of individuals having over a 12th grade education level. (78.0% is the median of all county education data studied).d High indicates a county with greater than 78.0
e Grade are coded as followings: Well differentiated; Grade I; Moderately differentiated; Grade II; Poorly differentiated; Grade III; Unknown.
f ER: Estrogen Receptor; PR: Progesterone Receptor.