Question

Fill in the table below for columns A and B. The table shows different associations where Factors X and Z are being measured for their effect on an outcome. For each effect measure there are shown three results: a result with Factor X only (X+Z-), a result with Factor Z only (X-Z+), and the Observed Joint Effect for both factors (X+Z+). In column A, indicate whether the interaction is positive or negative, and in column B, indicate whether the interaction is additive or multiplicative. If no interaction is present, put “None” in columns A and B.

Effect Measure	Effect of Factor X (X+ Z-)	Effect of Factor Z (X- Z+)	Observed Joint Effect (X+Z+)	A Positive or negative?	B Additive or multiplicative?
Attributable Risk	30.0 / 1000	55.0 / 1000	85.0 / 1000
Attributable Risk	15.0/1000	3.0/1000	25.0/1000	Positive
Relative Risk	4.0	3.0	19.0

Answer 1

Answer:

Effect Measure	Effect of Factor X (X+ Z-)	Effect of Factor Z (X- Z+)	Observed Joint Effect (X+Z+)	A Positive or negative?	B Additive or multiplicative?
Attributable Risk	30.0 / 1000	55.0 / 1000	85.0 / 1000	Negative	Additive
Attributable Risk	15.0/1000	3.0/1000	25.0/1000	Positive	Additive
Relative Risk	4.0	3.0	19.0	Positive	None