Table 3.
Mean Anthropometric Measures from Morbidly Obese Adolescent Males 1 Year after Bariatric Surgery Performed between 2004 and 2010, by Type of Surgerya
| Gastric Bypass | ||||
|---|---|---|---|---|
| Pre-Surgery (n=125) | 3 Months after Surgery (n=110) | 6 Months After Surgery (n=68) | 12 Months After Surgery (n=23) | |
| Estimate (SE) | Estimate (SE) | Estimate (SE) | Estimate (SE)b | |
| BMI (kg/m2) | 53.60(0.79) | 47.46(0.75) | 40.40(0.78) | 35.30(0.95) |
| BMI %ile | 99.92(0.02) | 99.80(0.03) | 98.61(0.37) | 96.85(0.89) |
| BMI Z score | 3.21(0.02) | 2.99(0.03) | 2.58(0.06) | 2.18(0.11) |
| BMI % changec | −0.10(0.05) | −1.34(0.37) | −3.10(0.87) | |
| Weight (kilograms) | 167.58(2.36) | 148.32(2.30) | 126.39(2.39) | 110.14(3.02) |
| Weight %ile | 99.96(0.02) | 99.79(0.06) | 98.68(0.38) | 96.76(0.99) |
| Weight Z score | 3.61(0.04) | 3.27(0.05) | 2.74(0.07) | 2.26(0.12) |
| WLd (kilograms) | 19.40(0.97) | 41.42(1.32) | 57.97(2.31) | |
| WL (%) | 11.47(0.53) | 24.49(0.78) | 33.66(1.35) | |
| Adjustable Gastric Band | ||||
| Pre-Surgery (n=100) | 3 Months after Surgery (n=92) | 6 Months After Surgery (n=67) | 12 Months After Surgery (n=38) | |
| Estimate (SE) | Estimate (SE) | Estimate (SE) | Estimate (SE)b | |
| BMI (kg/m2) | 49.14(0.77) | 46.18(0.78) | 43.40(0.82) | 41.31(0.85) |
| BMI %ile | 99.86(0.01) | 99.74(0.03) | 99.39(0.10) | 98.37(0.82) |
| BMI Z score | 3.07(0.03) | 2.94(0.03) | 2.75(0.05) | 2.57(0.07) |
| BMI % change | −0.12(0.02) | −0.50(0.10) | −1.48(0.80) | |
| Weight (kilograms) | 155.66(2.34) | 146.25(2.38) | 137.31(2.45) | 130.54(2.58) |
| Weight %ile | 99.93(0.01) | 99.85(0.02) | 99.54(0.11) | 98.63(0.65) |
| Weight Z score | 3.41(0.04) | 3.22(0.04) | 3.00(0.06) | 2.82(0.08) |
| WL (kilograms) | 9.46(0.59) | 18.41(1.15) | 25.18(1.84) | |
| WL (%) | 6.16(0.37) | 11.93(0.75) | 16.07(1.20) | |
model adjusted by age and race.
P<0.05for change across all time points, for all anthropometric measures, for both surgery types, with the exception of BMI percentile for adjustable gastric band. P<0.01 for changes between each time point, with the exception of BMI and weight percentile for adjustable gastric band between 6 and 12 months after surgery.
BMI % change = the difference between baseline BMI %ile and BMI %ile at each respective time point.
WL = estimated weight loss or the difference between baseline weight [kilograms] and weight at each respective time point. While % Excess Weight Loss ([%EWL], calculated by using the middle of the 1983 Metropolitan Life Insurance tables for median frame + % Weight Lost (%WL) + % Excess BMI Lost (%EBMIL) with excess > 25 kg/m2) is the standard measure used in the adult population, it is not appropriate for adolescents because the Metropolitan Life Insurance tables were designed for adults aged 25 to 59 years only.