Question

Please explain the below question answered 2 days ago

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

Answer 1