You have been asked to select subjects for a case-control study investigating the potential association between lawn/garden pesticide use and breast cancer risk. Please click on the selection "situations" (on the right) to see three potential means of selecting subjects. Question 2 of this exercise will ask you to pick the most appropriate selection situation.

Situation 1: Cases come from different areas throughout Epiville. Controls are selected from those attending the fancypants ^tm weight loss center at Star Hospital

Situation 2: Epiville General Hospital cases come from different areas, including outside Epiville. (As you may recall, Epiville General is a tertiary care facility and people from many areas come to see its specialists.)

Controls are selected from the admissions office with diagnoses of cancer, other than the cancer under study, and not related to our exposure or with diagnoses of non-cancer diseases.

Situation 3: Cases come from different areas throughout Epiville. Controls are selected from those attending the free clinic at Epiville General Hospital.