There was no evidence, among parous women, that increasing parity was associ- ated with risk of mucinous tumours. Relative to a first birth before age 25, a first birth at a later age was associated with a significant (60%) reduced risk of serous borderline tumours, and a marginally significant (40%) decreased risk of endometrioid/clear cell tumours; increasing age at first birth was significantly associated with a decreased risk of these tumour types (Table 6).
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