What appears to be the biggest confounder to systolic blood…

What appears to be the biggest confounder to systolic blood pressure (SBP) in comparing these models? Table 7-16: Multiple-Linear Regression Analyses of the Cross-Sectional Association Between Systolic Blood Pressure and Carotid IMT (mm) in a Subset of Participants of the Washington County Cohort of the Atherosclerosis Risk in Communities (ARIC) Study, Ages 45–64 Years, 1987–1989 Table 7-16   Linear Regression Coefficient   Model 1 Model 2 Model 3 Model 4 Intercept 0.4533 -0.0080 0.0107 -0.0680 Systolic blood pressure(1 mm Hg) 0.0025 0.0016 0.0014 0.0012 Age (1 year) Not included 0.0104 0.0096 0.0099 Gender (1 = male, 0 = female) Not included Not included 0.0970 0.0981 Body mass index (1 kg/m2) Not included Not included Not included 0.0033 Note: Intimal-medial thickness of the carotid arteries (measured in millimeters): average of B-module ultrasound measurements taken at six sites of the carotid arteries in both sides of the neck.

What is the formula for the relative risk (no words) based o…

What is the formula for the relative risk (no words) based on 2×2 table or incidence (Ie & Io), but no words at all. Since this is a formula – use the + and -, along with  “*” as multiplier and / as division as needed –  make sure to use proper parentheses.