A Patient-Centered Electronic Tool for Weight Loss Outcomes after Roux-en-Y Gastric Bypass

Table 2

Results of quantile regression: formulas for selected percentiles of weight loss.

Percentile	Formula
25th (most weight loss)	25th %tile = 34.43 + 0.6878 * (BMI—50) + 0.03358 * (AGE—50) − 1.020 * (TIME—6) + 0.04580 * (TIME—6); * (TIME—6) − 0.00055 * (TIME—6) * (TIME—6) * (TIME—6) − 0.00725 * (BMI—50) * (TIME—6); + 0.001608 * (AGE—50) * (TIME—6)
50th	50th %tile = 36.71 + 0.7308 * (BMI—50) + 0.02551 * (AGE—50) − 0.906 * (TIME—6) + 0.04298 * (TIME—6); * (TIME—6) − 0.00052 * (TIME—6) * (TIME—6) * (TIME—6) − 0.00527 * (BMI—50) * (TIME—6); + 0.001542 * (AGE—50) * (TIME—6)
75th (least weight loss)	75th %tile = 39.11 + 0.7839 * (BMI—50) + 0.02443 * (AGE—50) − 0.790 * (TIME—6) + 0.03937 * (TIME—6); * (TIME—6) − 0.00048 * (TIME—6) * (TIME—6) * (TIME—6) − 0.00399 * (BMI—50) * (TIME—6); + 0.000927 * (AGE—50) * (TIME—6)

BMI: preoperative BMI; AGE: years of age at initial preoperative visit; TIME: months after surgery.