Complex association between Hb level and GFR, sex, and AER Complex association between Hb level and GFR, sex, and AER. Subgroups were stratified according to overt macroalbuminuria, persistent microalbuminuria, normoalbuminura with low GFR (<60 ml · min−1 · 1.73 m−2), and normoalbuminura without low GFR (>60 ml · min−1 · 1.73 m−2). Complex association between Hb level and GFR, sex, and AER. Subgroups were stratified according to overt macroalbuminuria, persistent microalbuminuria, normoalbuminura with low GFR (<60 ml · min−1 · 1.73 m−2), and normoalbuminura without low GFR (>60 ml · min−1 · 1.73 m−2). Merlin C. Thomas et al. Dia Care 2003;26:1164-1169 ©2003 by American Diabetes Association