Parity and risk of death from subarachnoid hemorrhage in women: evidence from a cohort in Taiwan.

The authors examined the relationship in women between age at first birth, parity, and subarachnoid hemorrhage mortality. They followed each woman from the time of her first birth and linked vital status with a mortality database. The risk was increased by 8% for each additional year of mother's age at first birth. The relative risk was 0.63 for women who had borne two children and 0.62 for women with three or more births.