A study of the association of breast cancer with duration of oral contraceptive (OC) use compared a group of women with breast cancer with a group of women of similar ages who were admitted to the same hospital for non-cancer diseases. From interviewing the subjects it could be determined who had used OC in the past and for how long. The following data were gathered.

OC Duration Breast Cancer Hospital controls
Never Used 235 273
< 1 year 27 26
1-4 year 43 29
> 4 years 46 23

Calculate the appropriate measure of association for this case control study and the 95% CI for each level of OC duration, using never users as the common reference group.

answer: i guess 5 units?

step-by-step explanation:

all group life insurance is term insurance. actually it is annual renewable term and it is rated on the average age and claims experience of the entire group, which is called "experience rating." remember, this type of insurance has a 31-day grace period and is convertible to whole life upon leaving employment. a contributory group plan requires that both the employer and the employees pay part of the premium. at least 75% of those eligible must participate, so the group is sure to get most of the healthy employees as well as those that are sick.

step-by-step explanation:

your answer is -9

step-by-step explanation: