| Characteristic | Group; no. (%) or mean ± SD | Difference* (95% CI) | |
|---|---|---|---|
| Out of country n = 4852 | OBN n = 5179 | ||
| Age, yr | 43.7 ± 10.3 | 44.9 ± 10.3 | 1.3 (0.9 to 1.6) |
| Sex, female | 3868 (80.5) | 4258 (82.2) | 1.7 (0.2 to 3.3) |
| ACG comorbidity score | p = 0.3 | ||
| ≤ 2 | 123 (2.5) | 72 (1.4) | |
| 3 | 2844 (58.6) | 3077 (59.4) | |
| 4 | 1385 (28.5) | 1524 (29.4) | |
| 5 | 500 (10.3) | 506 (9.8) | |
| Rural residence† | 898 (18.5) | 818 (15.8) | -2.7 (-4.2 to -1.2) |
| Neighbourhood income quintile‡ | p = 0.5 | ||
| 1 (lowest) | 1096 (22.7) | 1169 (22.6) | |
| 2 | 1109 (23.0) | 1201 (23.3) | |
| 3 | 1005 (20.8) | 1058 (20.5) | |
| 4 | 898 (18.6) | 1008 (19.5) | |
| 5 (highest) | 718 (14.9) | 728 (14.1) | |
| Procedure: gastric bypass | 4868 (99.9) | 4738 (91.5) | -8.4 (-7.6 to -9.2) |
Note: ACG = Johns Hopkins Adjusted Clinical Group, CI = confidence interval, NS = not significant, OBN = Ontario Bariatric Network, SD = standard deviation.
*Differences are reported as percentages with the exception of age, where mean difference is reported. For comparisons of characteristics with more than 2 categories, p values are reported.
†Rural residence was defined as residence in a community with a population less than 10 000.
‡Income quintile was determined by linking residential postal code to its corresponding dissemination area and then calculating the average income per person in the area. Areas were then ranked and divided into quintiles. The lowest income quintile was coded as 1 and the highest was coded as 5.