Table 1. RDW levels correlation with GOLD COPD stages (p<0.001).

RDW: Red cell distribution width; GOLD: Global initiative for chronic obstructive lung disease.

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Tertemiz KC, Ozgen Alpaydin A, Sevinc C, Ellidokuz H, Acara AC, Cimrin A: Could "red cell distribution width" predict COPD severity?. Rev Port Pneumol (2006). 2016, 22:196-201. 10.1016/j.rppnen.2015.11.006 [9].

GOLD Stages	Mean RDW (%)
Stage 1	13.5
Stage 2	13.9
Stage 3	14.4
Stage 4	15.7