There was a clear trend for decreasing RRs with increasing parity in all morphologies, except mucinous tumours, which showed no trend.
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Population attributable fractions for ovarian cancer in Swedish women by morphological type.
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The sentences
Variables included in the Poisson regression models were age at diagnosis, family history, parity, age at first child birth, all of which had a significant or borderline significant effect on the risk of EOC; additionally, the effect of socioeconomic status and residential area were tested.