Table 2.

Associations of Obstetrics/Gynecology Specialist Supplies with Breast Cancer 5-Year Survival in Ontario: Women Diagnosed Between 1995 and 1997 Were Followed Until January 1, 2003

Obstetrician/Gynecologist Supply PredictorRisk FactorPrevalence (%)Breast Cancer5-Year Survival(OR [95% CI])
Provincial analysis of 17,829 breast cancer cases
    ≥6 per 100,000 in 2001<659.71.13 (1.01–1.27)
Analysis of 10,745 cases outside the greater metropolitan Toronto area
    Decreased by ≥2 per 100,000 in 1991 and 2001*20.20.76 (0.61–0.96)
  • All effects were adjusted for patient age, census tract low-income prevalence, census division age distribution, distance from regional cancer centers, and general practitioner supplies. Total physician density did not enter the model. There were 648 and 664 active obstetrician/gynecologists in Ontario in 1991 and 2001, respectively.

  • * Sensitivity analyses revealed the most predictive criterion decrement.

  • Overrepresented by small to mid-sized cities with populations between 100,000 and 500,000.