Table 3: Multinomial regression results showing the effect of neighbourhood variables on the relative risk of being a specialist cluster versus a mixed cluster
VariableRR (95% CI)
Gastroenterology cluster v. mixed cluster
Rural0.12 (0.01-0.35)
Socioeconomic quartile
    1Reference
    20.68 (0.42-1.05)
    30.85 (0.55-1.28)
    41.74 (1.14-2.56)
Distance, every 50 km0.76 (0.58-0.93)
Surgical cluster v. mixed cluster
Rural5.38 (3.48-8.01)
Socioeconomic quartile
    1Reference
    21.57 (1.00-2.38)
    30.78 (0.47-1.21)
    40.60 (0.33-1.00)
Distance, every 50 km1.02 (0.96-1.08)

Note: CI = confidence interval, RR = relative risk.