Question 61 pts

Based on the study in question 3, the researchers wanted to determine if age affected the association between sleep medication use and memory loss. They stratified the subjects according to age < 60 years and age > 60 years. Based on this data, what role does age play in this study? The criteria for a clinically significance difference is 10%. (select one best answer)

Stratum 1: Age < 60 (years)	Memory loss	No memory loss	Total
Sleep medication	27	100	127
No sleep medication	23	135	158
Total	50	235	285

Stratum 2: Age > 60 (years)	Memory loss	No memory loss	Total
Sleep medication	273	340	613
No sleep medication	42	80	122
Total	315	420	735

Group of answer choices

Confounder

Effect modifier

Neither a confounder or effect modifier