| Outcome | Group; no. (%) or mean ± SD | Difference* (95% CI), % | |
|---|---|---|---|
| Out of country n = 4852 | OBN n = 5179 | ||
| Any use of hospital services† | 2513 (51.8) | 2610 (50.4) | -1.4 (-3.3 to 0.6) |
| No. of days hospital services used by patients requiring ≥ 1 day | 5.1 ± 12.4 | 4.7 ± 9.2 | -0.5 (-0.1 to 1.1) |
| Any emergency department visit | 2311 (47.6) | 2409 (46.5) | -1.1 (-3.1 to 0.8) |
| No. of emergency department visits among patients with ≥ 1 visit | 2.4 ± 2.4 | 2.3 ± 2.2 | -0.1 (-0.1 to -0.3) |
| Any hospitalization | 832 (17.2) | 1014 (19.6) | 2.4 (0.9 to 4.0) |
| No. of days in hospital among patients requiring a hospital stay | 8.7 ± 19.2 | 6.5 ± 12.5 | -2.2 (-0.6 to -3.7) |
| Any ICU stay | 66 (1.4) | 119 (2.3) | 0.9 (0.4 to 1.5) |
| No. of days in ICU among patients requiring an ICU stay | 10.6 ± 12.3 | 4.7 ± 10.8 | -5.9 (-2.3 to -9.5) |
| Any ventilatory support | 29 (0.6) | 52 (0.5) | -0.4 (-0.8 to -0.06) |
| No. of ventilated days among patients requiring ventilation | 11.1 ± 12.1 | 4.5 ± 8.2 | -6.6 (-1.5 to -11.6) |
| Any physician assessment | 312 (6.4) | 1761 (34.0) | 27.6 (26.1 to 29.0) |
| No. of physician assessments among patients with ≥ 1 assessment | 1.6 ± 1.8 | 1.2 ± 0.6 | -0.4 (-0.2 to -0.6) |
| Reoperation | 49 (1.01) | 197 (3.8) | 2.8 (2.2 to 3.4) |
| No. of reoperations among patients with ≥ 1 reoperation | 2.8 ± 1.8 | 1.4 ± 0.7 | -1.4 (-0.9 to -1.9) |
| 30-d mortality | 4 (0.1) | 7 (0.1) | 0.05 (-0.2 to 0.08) |
| 1-yr mortality | 13 (0.3) | 13 (0.3) | 0.13 (-0.2 to 0.2) |
Note: CI = confidence interval, ICU = intensive care unit, OBN = Ontario Bariatric Network, SD = standard deviation.
*Differences are reported as percentages with the exception of mean differences.
†Hospital services = total no. of emergency department visits + days in hospital.