TABLE 11.20 Multiple linear regression of 24- hour urinary Na on casual urinary measurements and other risk factors, INTERSALT Study, men, n = 1369 Variable Beta se Intercept 25.46 16.63 Casual Na (mmoi/L) 0.46 0.02 Casual creatinine (mmoi/L) -2.75 0.22 Casual potassium (mmoi/L) -0.13 0.04 Body mass index (kg/m?) 4.10 0.31 Age (years) 0.26 0.78 Age2 (years?) 0.00 0.01 11.29 What does the regression coefficient for casual potassium (-0.13) mean in words? 11.30 Provide a two-sided p-value and a 95% Cl associ- ated with this coefficient