Effect of Other Variables
As shown in Table 3, the type of soy protein did not
have a significant effect on the net change in serum
cholesterol concentrations and accounted for only approximately
1.0 percent of the variance. The amount
of soy protein in the diet was also not significant
(P0.39) when net changes were assessed. The type
of diet, although not statistically significant, accounted
for approximately 12.6 percent of the variance
(P0.07); larger changes tended to occur when the
control diets were “usual” diets rather than low-fat and
low-cholesterol diets. The results of studies of adult
subjects did not differ significantly from those of the
four studies of children; the age group of the subjects
thus had a negligible effect on variance. The changes
in the 19 studies with similar diets in terms of fat and
cholesterol intake and weight change did not differ significantly
from the changes in the remaining studies, in
which the diets were not similar; this factor accounted
for negligible variance.