Table 1.
Baseline characteristics of patients
| Variable | Total (n= 3137) | LAGB (n= 1400) | Gastric bypass(n= 1067) | Sleeve gastrectomy(n= 446) |
|---|---|---|---|---|
| Age at the time of surgery, mean years (SD) | 48.4 (10.3) | 47.3 (9.9) | 48.8 (10.3) | 50.6 (10.6) |
|
| ||||
| Male sex, n (%) | 633 (20.2) | 206 (14.7) | 246 (23.1) | 120 (26.9) |
|
| ||||
| Number of patients with available BMI pre-surgery data, n (%) | 3076 (98.1) | 1373 (98.1) | 1050 (98.4) | 437 (98.0) |
| BMI pre-surgery, mean (SD)a | 45.3 (8.9) | 43.3 (8.5) | 46.8 (7.9) | 47.6 (9.1) |
| BMI pre-surgery, median (IQR)a | 44.6 (39.3 to 50.2) | 42.3 (37.9 to 47.3) | 46.7 (41.4 to 51.5) | 46.8 (41.7 to 52.8) |
|
| ||||
| Number of patients with available BMI post-surgery data, n (%) | 2097 (66.9) | 1031 (73.6) | 680 (63.7) | 245 (54.9) |
| BMI post-surgery, mean (SD)a,b | 36.8 (8.8) | 37.2 (8.8) | 34.9 (7.9) | 38.3 (8.5) |
| BMI post-surgery, median (IQR)a,b | 36.1 (30.7 to 41.7) | 36.3 (30.9 to 42.3) | 34.2 (29.5 to 39.1) | 38.2 (32.3 to 43.5) |
| Year of last available BMI recording post-surgery, mean (SD)a | 2.7 (2.1) | 3.3 (2.3) | 2.1 (1.7) | 1.9 (1.6) |
| Year of last available BMI recording post-surgery, median (SD)a | 2.3 (1.0 to 4.0) | 3.0 (1.5 to 4.7) | 1.8 (0.7 to 3.2) | 1.5 (0.7 to 2.4) |
|
| ||||
| Townsend deprivation quintile, n (%) | ||||
| 1 | 610 (19.5) | 312 (22.3) | 190 (17.8) | 73 (16.4) |
| 2 | 526 (16.8) | 251 (17.9) | 170 (15.9) | 66 (14.8) |
| 3 | 594 (18.9) | 280 (20.0) | 196 (18.4) | 79 (17.7) |
| 4 | 559 (17.8) | 213 (15.2) | 214 (20.1) | 88 (19.7) |
| 5 | 405 (12.9) | 157 (11.2) | 151 (14.2) | 61 (13.7) |
| Missing data | 443 (14.1) | 187 (13.4) | 146 (13.7) | 79 (17.7) |
|
| ||||
| Ethnicity, n (%) | ||||
| White | 1637 (52.2) | 692 (49.4) | 585 (54.8) | 244 (54.7) |
| African-Caribbean | 61 (1.9) | 19 (1.4) | 29 (2.7) | 11 (2.5) |
| South Asian | 48 (1.5) | 14 (1.0) | 24 (2.3) | 6 (1.4) |
| Mixed race | 11 (0.4) | 7 (0.5) | 3 (0.3) | 0 (0.0) |
| Chinese/Middle Eastern/Other | 14 (0.5) | 10 (0.7) | 2 (0.2) | 2 (0.5) |
| Missing data | 1366 (43.5) | 658 (47.0) | 424 (39.7) | 183 (41.0) |
a
Summary statistics based on available data only.
b
Last recording available in the database. BMI = body mass index. IQR = interquartile range. LAGB = laparoscopic adjustable gastric banding. SD= standard deviation.