Table 1.
Baseline characteristics and changes over a year in anthropometric measures and body composition for sleeve gastrectomy and nonsurgical groups
| Baseline measures | P value | Change over 12 months | P value | P value adjusted for baseline age, sex, and race | |||
|---|---|---|---|---|---|---|---|
|
Surgical
(n = 30) |
Nonsurgical
(n = 34) |
Surgical
(n = 29) |
Nonsurgical
(n = 29) |
||||
| Clinical characteristics | |||||||
| Age (years) | 18.2 ± 0.4 (n = 30) |
17.7 ± .5 (n = 34) |
.550 | — | — | — | — |
| Sex (F/M) | 24/6 (n = 30) |
27/7 (n = 34) |
1.000 | — | — | — | — |
| Race (non-Black/black) | 7/23 (n = 30) |
6/28 (n = 34) |
.687 | — | — | — | — |
| Height (cm) | 169.1 (160.8, 174.2) (n = 30) |
165.2 (161.2, 171.3) (n = 34) |
.637 | .4 (–0.3, 1.2)* (n = 29) |
.4 (–0.1, 1.4)** (n = 29) |
.674 | .219 |
| Weight (kg) | 127.3 (111.3, 144.7) (n = 30) |
117.9 (99.5, 127.2) (n = 34) |
.007 † | –32.6 (–45.3, –26.7)**** (n = 29) |
2.6 (–2.3, 5.5) (n = 29) |
<.0001 | <.0001 |
| BMI (kg/m2) | 44.8 (41.7, 50.0) (n = 30) |
41.6 (37.9, 45.8) (n = 34) |
.003 † | –12.1 (–15.4, –9.1)**** (n = 29) |
0.6 (–1.2, 1.7) (n = 29) |
<.0001 | <.0001 |
| BMI z-score | 2.48 (2.34, 2.73) (n = 30) |
2.41 (2.21, 2.61) (n = 34) |
.113† | –0.70 (–0.99, –0.46)**** (n = 29) |
–0.03 (–0.10, –0.003)* (n = 29) |
<.0001 | <.0001 |
| Moderate to vigorous activity (hours/week) | 25.3 (9.3, 46.4) (n = 28) |
24.8 (13.4, 31.3) (n = 34) |
.826 | 9.0 (–4.5, 23.3) (n = 25) |
3.3 (–14.0, 22.5) (n = 29) |
.410 | .334 |
| Body composition (by DXA) | |||||||
| Total lean mass (kg) | 62.4 (56.1, 70.2) (n = 30) |
59.6 (51.2, 67.7) (n = 34) |
.168† | –10 (–1.3, –5.9)**** (n = 29) |
1.5 (–0.1, 3)** (n = 29) |
<.0001 | <.0001 |
| Total fat mass (kg) | 64.6 ± 2.4 (n = 30) |
55.2 ± 1.8 (n = 34) |
.002 † | –25.4 ± 2.2**** (n = 29) |
0.1 ± 1.0 (n = 29) |
<.0001 | <.0001 |
Data are presented as mean ± standard error of the mean or median (interquartile range); significant P values are in bold.
Between group differences in baseline measures and changes over 12 months were compared using the Student t-test for parametric data and the 2-sample Wilcoxon rank sum test for nonparametric data.
Abbreviations: BMI, body mass index; DXA, dual-energy X-ray absorptiometry.
† P < .05 after adjusting for baseline age, sex and race (Black vs non-Black) for baseline measures.
Within-group changes over 12-months were assessed using paired t-test (for parametric data) and using Wilcoxon signed rank test (for non-parametric data):
*P < .05,
** P < .01;
*** P < .001, and
**** P < .0001. indicate a significant within-group change over 12 months