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Table 3 Nutritional deficiencies in each surgery group pre-operation and during follow-up

From: Two-year outcomes of sleeve gastrectomy versus gastric bypass: first report based on Tehran obesity treatment study (TOTS)

Nutritional deficiencies Surgical technique Pre operation Post operation  
   12th month 24th month P-value
Iron deficiency Anemia SG 326(15.3) 202 (25.1) 41 (27.7) <.001
GB 199 (18.8) 197 (39.6) 88 (55.0) <.001
P-value .014 <.001 <.001
Hematocrit, deficiency SG 159 (7.7) 134(16.7) 28 (18.9) <.001
GB 101 (10.0) 148 (29.8) 67 (42.1) <.001
P-value .034 <.001 <.001  
Ferritin deficiency SG 105 (6.9) 91 (15.7) 22 (25.6) <.001
GB 69 (8.5) 99 (25.0) 56 (45.9) <.001
P-value .163 <.001 .003
Iron deficiency SG 164 (8.7) 32 (5.2) 12 (14.5) .341
GB 87 (9.2) 48 (12.2) 19 (17.8) .004
P-value .631 <.001 .542
Copper deficiency SG 65 (3.7) 26 (5.8) 8 (8.5) .002
GB 41 (4.7) 22 (8.5) 11 (13.9) <.001
P-value .211 .178 .257
Zinc deficiency SG 32 (1.6) 9 (1.3) 0 (0.0) .010
GB 25 (2.5) 16 (3.5) 10 (5.0) .054
P-value .097 .011 <.001
Calcium deficiency SG 32 (1.6% 4 (0.6%) 2 (1.8) .246
GB 23 (2.2) 16 (3.7%) 5 (4.2) .121
P-value .173 <.001 .449
Phosphate deficiency SG 32 (1.6) 2 (0.3) 0 .012
GB 7 (0.7) 1 (0.2) 0 .187
P-value .040 >.999
Vitamin B12 deficiency SG 251 (12.8) 78 (10.2) 8 (3.2 <.001
GB 149 (14.9) 39 (8.3) 15 (7.6) <.001
P-value .106 .265 .037
25 (OH) vitamin D deficiency SG 997 (50.6) 140 (19.3) 27 (22.5) <.001
GB 484 (49.9) 83 (19.2) 23 (17.7) <.001
P-value .726 .982 .342
Hypo albuminemia, < 2.5 g/dL SG 0 (0.0) 0 (0.0) 0 (0.0)
GB 0 (0.0) 11 (1.5) 3 (1.0) 0.003
P-value < 0.001 0.060
  1. SG sleeve gastrectomy, GB gastric bypass
  2. Data are presented as n (%)