Proportion of study participants with low level of serum iron before and after RYGB surgery
| Before surgery | 6 months | 12 months | 24 months | 36 months | Δ6 month | Δ12 month | Δ24 month | Δ36 month | Cut-off point in serum iron level | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Year | Author | No. | Per cent | No | Per cent | No | Per cent | No | Per cent | No | Per cent | (Per cent) | (Per cent) | (Per cent) | (Per cent) | |
| 2006 | Madan AK | 9/64 | 14.0 | 6/56 | 10.0 | 2/36 | 6.0 | – | – | – | – | −4.0 | −8.0 | – | – | NR |
| 2009 | Toh SY | 15/100 | 15.0 | – | – | 11/53 | 21.0 | – | – | – | – | – | 6.0 | – | – | <50 μg/dL |
| 2012 | Blume CA | 10/170 | 5.9 | 10/170 | 5.9 | 2/170 | 1.2 | 15/170 | 8.8 | 14/170 | 8.2 | 0 | −4.7 | 2.9 | 2.3 | Men <49 μg/dL; women <37μg/dL |
| 2013 | Moizé V | 78/294 | 26.5 | 54/294 | 18.2 | 47/294 | 15.9 | 27/259 | 10.6 | 25/203 | 12.5 | −8.3 | −10.6 | −15.9 | −14.0 | < 50 μg/dL |
| Summary estimate (95% CI) | 15.3 (4.7 to 25.9) | 11.4 (2.8 to 20.0) | 10.5 (0.6 to 20.3) | 9.8 (7.0 to 12.6) | 10.2 (6.0 to 14.4) | −3.7 (−9.4 to 2.0) | −5.6 (−10.8 to −0.4) | −6.4 (−24.9 to 12.0) | −5.7 (−21.7 to 10.3) | |||||||
| I2 | 93.1 | 89.0 | 94.2 | 0.0 | 46.9 | 47.5 | 47.0 | 94.8 | 92.6 | |||||||
NR, not reported; RYGB, Roux-en-Y gastric bypass.