Serum cholesterol of residents in north Iowa.

A survey of serum cholesterol levels was done on 219 residents in north Iowa. Population reference values of serum cholesterol for the community were developed. Data indicate age is an influential factor in both sex groups. Consumption of oral contraceptives appears to be a significant factor in increased serum cholesterol levels in females. Although cigarette smoking seems to augment serum cholesterol level superficially, its relationship is not statistically significant in the study.