INTRODUCTION:We aimed to assess the association between a patient's social status and the cost of stay for a single uncomplicated vaginal delivery. Currently, few data have been reported.MATERIAL AND METHODS:We conducted an observational study with data retrieved from the medical and administrative databases of a university hospital in North-West France. We included all patients admitted in 2014 and classified in either Diagnosis-Related Group (DRG) « Single uncomplicated vaginal deliveries in a primiparous patient » or DRG « Single uncomplicated vaginal deliveries in a multiparous patient ». Criteria defining poor social status were: a specific healthcare benefit in relation to low income or for foreign undocumented patients, and/or a consultation with a social worker during the hospital stay except if no social problem was diagnosed. We compared the cost of stay between patients with poor social status and patients with good social status using a multivariate median regression stratified on parity, and adjusted for age, gestational age and neonatal hospitalization.RESULTS:Among 686 primiparous patients, 21% had poor social status, which was associated with an increase in the median cost of stay (+€475; 95% CI [+334 to +616]), mostly explained by a 1-day increase in the median length of stay.Among 899 multiparous patients, 29% had poor social status, which was not associated with the cost of stay.DISCUSSION:Social status had an impact on the cost of vaginal deliveries in primiparous patients. Our findings suggest a need to redefine the DRG classification according to patients' social status.