Table 1.
Descriptive statistics for the continuous study variables
| Total (n = 80) |
Females (n = 61) |
Males (n = 19) |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| mean | SD | range | mean | SD | mean | SD | t value | p value | |
| BMIand weight loss | |||||||||
| BMIat test | 43.7 | 4.92 | 34.6–56.0 | 43.5 | 5.06 | 44.3 | 4.50 | –0.64 | 0.521 |
| 30-Day preoperative WL (%) | 2.9 | 3.2 | –3.51 to 9.63 | 2.92 | 2.96 | 2.72 | 2.88 | –0.25 | 0.803 |
| Eating behavior | |||||||||
| Dietary adherence | 4.76 | 1.24 | 1–7 | 4.87 | 1.16 | 4.41 | 1.45 | 1.42 | 0.158 |
| Grazing (Rep[eat] total mean score) | 1.21 | 1.09 | 0–4.73 | 1.27 | 1.06 | 1.01 | 1.19 | –0.90 | 0.368 |
| LOC binge-eating (frequency) | 1.35 | 4.39 | 0–30 | 1.45 | 4.94 | 1.05 | 1.95 | –0.72 | 0.736 |
| Neuropsychological test scores | |||||||||
| Working memory (SWM errors) | 39.2 | 20.2 | 3–88 | 38.3 | 19.5 | 42.1 | 22.8 | –0.71 | 0.480 |
| Planning (OTS problems solved on first choice) | 10.6 | 2.22 | 5–15 | 10.6 | 2.26 | 10.6 | 2.16 | 0.00 | 0.998 |
| Response inhibition (SSRT stop latency) Inhibitory control (CWIT) | 200 | 46.5 | 123–332 | 196 | 45.9 | 210 | 48.5 | –1.06 | 0.291 |
| Total error inhibition trial (scaled score) | 10.5 | 1.88 | 6–13 | 10.5 | 1.84 | 10.4 | 3.67 | 0.59 | 0.553 |
| Total time inhibition trial (scaled score) | 9.90 | 2.87 | 1–15 | 10.2 | 2.5 | 8.79 | 3.94 | 1.96 | 0.053 |
| Control variables | |||||||||
| Age | 41.0 | 10.7 | 19–62 | 40.0 | 11.1 | 44.5 | 9.03 | –1.60 | 0.112 |
| Matrix reasoning | 10.8 | 3.65 | 1–21 | 11.2 | 3.50 | 9.63 | 3.94 | 1.72 | 0.089 |
| Vocabulary | 8.0 | 1.81 | 3–13 | 8.16 | 1.65 | 7.74 | 2.25 | 0.89 | 0.372 |
| Depression | 3.95 | 3.37 | 0–13 | 4.02 | 3.47 | 3.73 | 3.10 | 0.32 | 0.746 |
BMI, body mass index; WL, weight loss; Rep(eat), repetitive eating questionnaire; LOC, loss-of-control; SWM, spatial working memory; OTS, One Touch Stockings of Cambridge; SSRT, stop signal reaction time; CWIT, Color-Word Interference Test.