Descriptive statistics for the Bariatric Experience Long Term mixed-methods study cohort in each survey period: baseline survey cohort (n=1975), baseline analytical sample (n=1341), year 1 analytical sample (n=999) and year 3 analytical sample (n=951)
| Baseline (n=1341) | Year 1 (n=999) | P value* | Year 3 (n=951) | P value* | |
| Women | 1150 (86%) | 860 (86%) | 0.92 | 824 (87%) | 0.73 |
| Race/ethnicity | |||||
| Hispanic | 504 (38%) | 370 (37%) | 0.75 | 345 (36%) | 0.41 |
| White | 440 (33%) | 340 (34%) | 0.45 | 324 (34%) | 0.43 |
| Black | 196 (15%) | 137 (14%) | 0.38 | 134 (14%) | 0.61 |
| Native American/Alaskan Native | 17 (1%) | 12 (1%) | 0.81 | 9 (1%) | 0.27 |
| Asian | 9 (<1%) | 6 (<1%) | 0.58 | 7 (<1%) | 0.75 |
| Native Hawaiian/Pacific Islander | 18 (1%) | 15 (1.5%) | 0.65 | 14 (1.5%) | 0.65 |
| Mixed | 127 (10%) | 96 (10%) | 0.86 | 98 (10%) | 0.35 |
| Other | 29 (2%) | 22 (2%) | 0.86 | 19 (2%) | 0.70 |
| Unknown | 1 (<1%) | 1 (<1%) | 0.79 | 1 (<1%) | 0.74 |
| Age (years) | 43.4±11.3 | 43.8±11.6 | 0.02 | 43.8±11.6 | 0.04 |
| Age categories (years) | |||||
| 18–29 | 160 (12%) | 117 (12%) | 0.81 | 114 (12%) | 0.92 |
| 30–39 | 385 (29%) | 278 (28%) | 0.53 | 265 (28%) | 0.57 |
| 40–49 | 384 (29%) | 274 (27%) | 0.42 | 259 (27%) | 0.32 |
| 50–64 | 371 (28%) | 295 (30%) | 0.21 | 282 (30%) | 0.18 |
| 65+ | 41 (3%) | 35 (3.5%) | 0.38 | 31 (3%) | 0.65 |
| Socioeconomic status (range 8–67) | 38±13 | 38±12 | 0.40 | 39±13 | <0.001 |
| Body weight (lbs) | 262.5±48.1 | 261.0±47.9 | 0.06 | 261.9±47.2 | 0.53 |
| Body mass index (kg/m2) | 43.1±6.4 | 42.9±6.4 | 0.07 | 43.1±6.5 | 0.81 |
| Body mass index categories (kg/m2) | |||||
| 30–34.99 | 76 (6%) | 59 (6%) | 0.74 | 59 (6%) | 0.44 |
| 35–39.99 | 401 (30%) | 302 (30%) | 0.84 | 275 (29%) | 0.51 |
| 40–49.99 | 685 (51%) | 510 (51%) | 1.00 | 488 (51%) | 0.92 |
| 50–59.99 | 157 (12%) | 113 (11%) | <0.001 | 112 (12%) | 0.92 |
| 60+ | 22 (2%) | 15 (1.5%) | 0.65 | 17 (2%) | 0.68 |
| Comorbidity burden (# of conditions) | |||||
| 0 | 494 (37%) | 359 (36%) | 0.58 | 356 (37%) | 0.72 |
| 1–2 | 671 (50%) | 506 (51%) | 0.76 | 466 (49%) | <0.001 |
| 3+ | 176 (13%) | 134 (13%) | 0.76 | 129 (13.5%) | 0.65 |
| Type 2 diabetes | 375 (28%) | 285 (28.5%) | 0.68 | 263 (28%) | 0.84 |
| Hypertension | 430 (32%) | 326 (33%) | 0.70 | 312 (33%) | 0.63 |
| Mental illness burden | |||||
| Serious mental illness | 150 (11%) | 119 (12%) | 0.43 | 108 (11%) | 0.86 |
| Severe anxiety/depression | 46 (3%) | 34 (3%) | 1.00 | 33 (3.5%) | 0.89 |
| Mild-to-moderate anxiety/depression | 450 (34%) | 329 (33%) | 0.71 | 325 (34%) | 0.71 |
| Substance abuse/eating disorder | 1 (<1%) | 0 | 1.00 | 1 (<1%) | 0.74 |
| None | 694 (52%) | 517 (52%) | 1.00 | 484 (51%) | 0.65 |
| Baseline (n=1341) | Year 1 (n=999) | P value* | Year 3 (n=951) | P value* | |
| Type of surgery | |||||
| Sleeve gastrectomy | 938 (70%) | 693 (39%) | 0.79 | 652 (69%) | 0.53 |
| Roux-en-Y gastric bypass | 400 (30%) | 305 (30.5%) | <0.001 | 297 (31%) | 0.35 |
| Other | 3 (<1%) | 1 (<1%) | 0.14 | 1 (<1%) | 0.18 |
| % Total weight loss year before surgery | 6.6±4.6 | 6.6±4.6 | 0.35 | 6.7±4.7 | 0.04 |
| Scheduled visit attendance (%) year before surgery (range 0%–100%) | 77±11 | 77.5±11 | 0.04 | 78±11 | 0.006 |
| % Total weight loss at 1 year (outcome) | 25.8±9.0 | 26.3±8.7 | <0.001 | 26.2±8.9 | 0.006 |
| Body mass index at 1 year (kg/m2) | 32.1±5.9 | 31.8±5.8 | 0.001 | 32.0±5.9 | 0.16 |
| Weight at 1 year (lbs) | 194.3±41.8 | 191.9±40.4 | <0.001 | 192.9±40.6 | 0.05 |
| % Total weight loss at 3 years (outcome) | 22.2±10.5 | 22.7±10.4 | 0.005 | 22.6±10.5 | 0.06 |
| Body mass index at 3 years (kg/m2) | 33.5±6.4 | 33.2±6.2 | 0.001 | 33.4±6.3 | 0.20 |
| Weight at 3 years (lbs) | 203.5±43.9 | 200.9±42.3 | <0.001 | 202.0±42.2 | 0.06 |
The formation of each of these analytical samples is shown in figure 2.
*Compared with baseline analytical cohort.