By comparing the mean age, no significant difference between those with and without breast feeding was observed 35
T-test showed there is a reverse relationship between parity number and breast density in both groups Table 2.
The dependent variable mammographic density was categorized into two levels:
Marital Status Chi-square test determined an association between marital status and breast density in the screening but not the diagnostic group.
Cancer incidence and mortality in Iran.
Studies have shown that increased breast density is associated with significant increase in breast cancer risk.
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So we decided to assess the distribution of this factor among Iranian population and evaluate its association with other risk factors and factors that may affect breast density based on previous studies.
High breast density group showed older age at the first delivery.