Table 3

Proportion of study participants with low ferritin level before and after RYGB surgery

Before surgery6 months12 months24 months36 monthsΔ6 monthΔ12 monthΔ24 monthΔ36 monthCut-off point in ferritin level
YearAuthorNoPer centNoPer centNoPer centNoPer centNoPer cent(Per cent)(Per cent)(Per cent)(Per cent)
2006Madan AK4/676.011/5620.06/3716.014.010.0NR
2009Toh SY2/1032.08/5315.013.0<15 ng/mL
2012Blume CA9/1705.37/1704.17/1704.127/17015.940/17023.5−1.2−1.210.618.2Men <22 ng/mL; Women <10 ng/mL
2013Moizé V55/29418.656/29419.058/29419.878/25930.160/20329.50.41.211.510.9<15 ng/mL
Summary estimate (95% CI)7.9 (0.95 to 14.8)13.9 (2.0 to 25.8)13.4 (3.5 to 23.4)23.0 (9.1 to 36.9)26.5 (20.6 to 32.4)2.4 (−4.2 to 9.0)4.1 (−2.2 to 10.4)11.0 (6.2 to 15.8)14.7 (7.5 to 21.8)
I292.494.191.392.142.263.562.90.045.7
  • NR, not reported; RYGB, Roux-en-Y gastric bypass.