Table 5: Unadjusted and adjusted rate ratios comparing 1-year postoperative health services use among patients in the Ontario Bariatric Network group and those who received surgery out of country, by patient characteristic
VariableUnadjusted rate ratio (95% CI)Adjusted rate ratio (95% CI)
Surgery through the Ontario Bariatric Network0.88 (0.82 to 0.95)0.90 (0.84 to 0.97)
Age1.00 (0.99 to 1.00)1.00 (0.99 to 1.00)
Sex (male v. female)1.09 (0.99 to 1.19)1.08 (0.98 to 1.19)
Procedure (gastric bypass v. other)0.88 (0.74 to 1.06)0.95 (0.79 to 1.15)
Rurality (rural v. urban)1.17 (1.07 to 1.29)1.26 (1.14 to 1.40)
ACG comorbidity score
    ≤ 21.00 (ref)1.00 (ref)
    31.46 (1.12 to 1.89)2.06 (1.53 to 2.76)
    42.29 (1.76 to 2.98)3.29 (2.44 to 4.44)
    54.42 (3.35 to 5.83)5.67 (4.15 to 7.75)
Income quintile
    1 (lowest)1.00 (ref)1.00 (ref)
    20.91 (0.82 to 1.00)0.90 (0.81 to 1.00)
    30.90 (0.81 to 1.00)0.90 (0.81 to 1.01)
    40.91 (0.81 to 1.01)0.98 (0.88 to 1.10)
    5 (highest)0.81 (0.72 to 0.91)0.79 (0.69 to 0.89)

Note: ACG = Johns Hopkins Adjusted Clinical Group, CI = confidence interval,

ref = reference category.