TABLE 3. Evolution of iron metabolism biochemical indicators at preoperative time and 1, 2, 3, 4, 5 and 10 years after Roux-en-Y gastric bypass.

		Iron			LIBC			Ferritin			Hemoglobin			Hematocrit
		(ug/dl)			(ug/dl)			(ng/ml)			(g/dl)			(%)
	n	Mean±SD	(%)	n	Mean±SD	(%)	n	Mean±SD	(%)	n	Mean±SD	(%)	n	Mean±SD	(%)
Preoperative	360	74.8±27.6	9.2	346	248.1±66.3	35.8	328	161.4±133.0	1.8	434	13.3±1.7	15.7	441	40.5±4.9	11.6
1 year PO	337	84.3±35.3a	8.9	243	218.5±79.3a	31.1	315	134.4±133.6a	3.5	336	12.9±1.9a	28	335	39.5±4.2a	16.7
2 years PO	152	83.4±38.6a	10.5	133	261.9±96.6b	43.8	143	92.1±103.7a,b	7	148	12.7±2a	31.8	148	39.0±4.4a	17.6
3 years PO	137	75.2±35.3b,c	17.5	122	273.1±97.3a,b	43.8	129	76.2±104.9a,b	14.7	139	12.3±2.3a,b	34.5	139	37.6±5.5a,b,c	24.5
4 years PO	99	80.5±39.2	14.1	89	267.2±90.6b	39.4	95	58.7±87.6a,b,c	8.4	104	12.4±1.8a,b	35.6	104	38.0±3.7a,b	19.2
5 years PO	65	72.6±33.4b,c	18.5	68	275.2±91.4a,b	50	60	40.0±53.5a,b,c	13.3	70	12.4±1.4a,b	38.6	70	37.4±5.5a,b,c	20
10 years PO	27	75.4±49.4a,e	18.5	27	243.8±114.8d,e	44.4	27	54.1±86.4a,b,c	11.1	27	12.7±2.2a	22.2	27	38.7±5.9a,b	22.2

PO=postoperative time; n=number of patients evaluated; (%)=percentage of patients with values outside the normal range; LIBC=latent iron binding capacity; a=p<0.05 compared to preoperative; b=p<0.05 compared to one year PO; c=p<0.05 compared to two years PO; d=p<0.05 compared to three years PO; e=p<0.05 compared to five years PO