Gender Homophily in Interphysician Referrals to Surgeons

The literature on gender homophily has mostly been focused on patient-physician relationship but not on interprofessional referrals. The goal of this study is to quantify interphysician gender homophily of referring physicians in surgical referrals.

An observational study of the referral data at a large academic center was performed. Patients referred through Epic to the department of general surgery from January 2016 to October 2019 were included. The primary end point was gender homophily and the primary independent variable was referring physician gender. Gender homophily was defined as greater than expected rates of gender concordance. Gender concordance was defined when referring physicians have the same gender as receiving surgeons. The expected concordance rate was defined as the availability of gender-concordant surgeons in the population. Absolute homophily is the difference between observed and expected concordance rates, whereas relative homophily is the ratio between observed and expected concordance rates.

A total of 25,271 patient referrals from 2625 referring physicians to 91 surgeons were analyzed. The overall observed concordance rate for the entire study population was 55.3% and was 31.7% among female physicians and 82.4% among male physicians. Compared to the expected concordance rate, the absolute gender homophily among all female physicians was +7.2% or a relative homophily of 1.29%. In contrast, the absolute gender homophily among all male physicians was +6.9% or a relative homophily of 1.09%.

Gender homophily exists in interprofessional referrals. Although referral decisions are presumably based solely on clinical factors, referrals can be affected by subjective biases.