Variable Dependent variable Sodium nitrite (N=23) Sodium chloride(N=39) SPP (N=39) φ (-)3.47 (-)0.024 (+)52.2 ζ (-)40.5 (+)52.2 (+)100a a19 correlations were negative and 20 were positive.

Table 1: Two-sided p-values (%) for sign test of Spearman correlations of dependent variable and specified independent variable, holding the others constant. The direction of the correlationa is given in parentheses: (-) means that most of the correlations were negative implying a decreasing relationship of dependent variable.