Table 7.

Comparison of predicted and observed postoperative BMI in studied samples

Model	ALL			RYGB			SG
	Predicted BMI	BMI difference	p-value	Predicted BMI	BMI difference	p-value	Predicted BMI	BMI difference	p-value
Baltasar_1	29.18±2.15	−3.64±5.15	<0.0001	29.30±2.20	−4.29±4.73	<0.0001	29.12±2.13	−3.30±5.32	<0.0001
Baltasar_2	30.15±2.61	−2.67±5.13	<0.0001	30.30±2.66	−3.30±4.71	<0.0001	30.08±2.58	−2.35±5.30	<0.0001
Baltasar_3	30.01±2.80	−2.81±5.13	<0.0001	30.16±2.86	−3.43±4.71	<0.0001	29.93±2.77	−2.49±5.31	<0.0001
Baltasar_4	30.66±2.80	−2.16±5.13	<0.0001	30.81±2.86	−2.78±4.72	<0.0001	30.58±2.77	−1.84±5.30	<0.0001
Wood	29.66±4.59	−3.16±5.45	<0.0001	30.03±4.67	−3.56±5.12	<0.0001	29.47±4.55	−2.95±5.60	<0.0001
Wise	25.35±8.49	−7.47±7.95	<0.0001	26.55±8.57	−7.04±7.78	<0.0001	24.73±8.39	−7.69±8.03	<0.0001
Goulard	30.75±4.38	−2.07±5.35	<0.0001	31.43±4.35	−2.16±5.09	<0.0001	30.40±4.36	−2.03±5.48	<0.0001
Seyssel	30.75±4.08	−2.08±5.18	<0.0001	31.18±4.09	−2.41±4.89	<0.0001	30.51±4.05	−1.91±5.32	<0.0001
Cottam_1	32.50±4.68	−0.32±5.51	0.007	33.38±4.48	−0.21±5.20	0.21	32.04±4.72	−0.38±5.67	0.02
Cottam_2	37.29±5.20	4.67±5.70	<0.0001	38.15±5.12	4.56±5.42	<0.0001	36.84±5.20	4.21±5.84	<0.0001
Janik	32.27±5.49	−0.55±5.69	0.0003	32.91±5.31	−0.68±5.40	0.04	31.94±5.55	−0.48±5.83	0.0055
Velázquez-Fernández	30.39±4.02	−2.43±5.26	<0.0001	30.62±4.07	−2.97±4.88	<0.0001	30.27±3.99	−2.15±5.42	<0.0001

Data are shown as mean ± standard deviation

BMI difference means the difference between predicted and observed body mass index after surgery

p-values refer to the comparison between predicted and observed body mass index after surgery with the use of a paired sample t test

Embolden p-values indicate statistically significant result

Abbreviations: RYGB Roux-en-Y gastric bypass, SG sleeve gastrectomy, BMI body mass index