The table below comes from a study of ovarian cancer survival in Australia (Anuradha et al., 2015).
Risk of mortality in a prognostic cohort study of women with invasive epithelial ovarian
Cancer according to the number of comorbidities at time of diagnosis (Australia, 2005) These data suggest that (select all that apply):
A)Compared to women with no comorbidity, having 3 or more co‐morbidities at diagnosis was associated with higher risk of mortality, but this association was Partially confounded by age
B)Compared to women with no comorbidity, having 3 or more comorbidities at diagnosis was associated with higher risk of mortality and there was no confounding By age
C)Compared to women with no co‐morbidity, having a greater number of comorbidities at diagnosis was not associated with a higher risk of mortality
D)The trend of increasing mortality with greater comorbidity seen in the unadjusted data disappeared after adjustment for age

Question

The table below comes from a study of ovarian cancer survival in Australia (Anuradha et al., 2015).
Risk of mortality in a prognostic cohort study of women with invasive epithelial ovarian
Cancer according to the number of comorbidities at time of diagnosis (Australia, 2005)  These data suggest that (select all that apply):
A)Compared to women with no comorbidity, having 3 or more co‐morbidities at diagnosis was associated with higher risk of mortality, but this association was Partially confounded by age 
B)Compared to women with no comorbidity, having 3 or more comorbidities at diagnosis was associated with higher risk of mortality and there was no confounding By age 
C)Compared to women with no co‐morbidity, having a greater number of comorbidities at diagnosis was not associated with a higher risk of mortality 
D)The trend of increasing mortality with greater comorbidity seen in the unadjusted data disappeared after adjustment for age

Quizplus · Accepted Answer

Having 3 or more comorbidities at diagnosis was fairly clearly related
to higher risk of mortality in the crude analysis but this association became much
weaker after adjustment for age suggesting there was some confounding by age in
these data.There is a modest trend of increasing risk in the crude data, which
essentially disappears with age‐adjustment.

The Table Below Comes from a Study of Ovarian Cancer