Table 4: Rate ratios comparing 1-year postoperative health services use among patients who received bariatric surgery in Ontario hospitals outside the Ontario Bariatric Network after versus before 2010

Outcome	Rate ratio* (95% CI)
Hospital services	1.07 (0.59 to 1.93)
Emergency department visits	0.70 (0.45 to 1.07)
Days in hospital	1.04 (0.55 to 1.99)
Days in ICU	0.13 (0.02 to 1.14)
Ventilatory support	0.13 (0.01 to 26.3)
Physician assessments	4.74 (2.36 to 9.5)
Reoperations	0.81 (0.13 to 5.00)

Note: CI = confidence interval, ICU = intensive care unit.

*Estimated using a negative binomial regression model adjusted for age, sex, household income quintile in neighbourhood of residence, rurality, type of bariatric surgery (gastric bypass v. other) and Johns Hopkins Adjusted Clinical Groups comorbidity score.