Moreover, the associations among feelings about breastfeeding, receipt of support group information, and postpartum depression at 2 months did not
differ significantly
by parity (all cross-product P >.15).
Other variables (maternal
parity, housing stability, hospitalization, perceived health status, employment, use of the Women, Infants, and Children Supplemental Nutrition Program, and cigarette smoking; whether the mother was living with a partner; and infant gestational age, birth weight, need for transfer to an intensive care nursery, health insurance, special needs, health status as perceived
by the mother, and age at the time of the survey) were included if the adjusted odds ratio
differed from the crude odds ratio
by at least 10 %, which is a well - accepted method of confounder selection when the decision of whether to adjust is unclear.42, 43 Any variable associated with both the predictor (depression) and the outcome (infant health services use, parenting practices, or injury - prevention measures) at P <.25, as suggested
by Mickey and Greenland, 42 was also included.