Table 3: Unadjusted and adjusted rate ratios comparing 1-year postoperative health services use and mortality among patients in the Ontario Bariatric Network and those who received bariatric surgery out of country

Outcome	Unadjusted rate ratio (95% CI)	Adjusted* rate ratio (95% CI)
Hospital services	0.88 (0.82 to 0.95)	0.90 (0.84 to 0.97)
Emergency department visits	0.92 (0.86 to 0.98)	0.98 (0.92 to 1.05)
Days in hospital	0.86 (0.73 to 1.00)	0.88 (0.75 to 1.03)
Days in ICU	0.74 (0.45 to 1.25)	0.78 (0.45 to 1.35)
Ventilatory support	0.68 (0.31 to 1.49)	0.67 (0.27 to 1.65)
Physician assessments	4.06 (3.66 to 4.50)	4.10 (3.69 to 4.56)
Reoperations	1.86 (1.37 to 2.53)	1.84 (1.34 to 2.53)
	Unadjusted OR (95% CI)	Adjusted† OR (95% CI)
30-day mortality	1.64 (0.48 to 5.61)	1.61 (0.47 to 5.54)
1-year mortality	0.93 (0.43 to 2.02)	0.87 (0.40 to 1.89)

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

*Adjusted variables included age, sex, procedure, rurality, income quintile and comorbidity score.

†Adjusted variables included age and sex.