In the study on bereavement and hospitalization for mental illness, the investigators were interested in possible effect modification by whether the parent was a mother or a father. They stratified the data as shown below.

MOTHERS	Hospital Admissions	Person-Years		FATHERS	Hospital Admissions	Person-Years
Bereaved	381	115,542		Bereaved	146	59,739
Non-bereaved	11,333	6,538,730		Non-bereaved	8,853	4,897,438

Compute the incidence rate ratio for the association of being bereaved, compared to being non-bereaved, on parental admission to a mental hospital, separately for mothers and fathers. You should report two incidence rate ratios, one for mothers and one for fathers. (You do not need to provide any interpretations.) (4 points)