Table 3.

Observed frequency (%) of US population with low iron indexes by renal functiona

CrClWomenMen
Transferrin Saturation < 20%, % (95% CI)Serum Ferritin < 100 ng/ml, % (95% CI)Transferrin Saturation < 20%, % (95% CI)Serum Ferritin < 100 ng/ml, % (95% CI)
a CrCl, creatinine clearance; 95% CI, 95% confidence interval.
Overall40 (38–43)76 (74–78)21 (19–23)32 (30–34)
CrCl > 80 ml/min43 (40–46)81 (79–84)20 (18–22)31 (29–33)
80 ≥ CrCl > 70 ml/min38 (34–42)81 (77–85)21 (16–25)28 (23–34)
70 ≥ CrCl > 60 ml/min37 (32–42)78 (74–81)22 (17–27)36 (29–43)
60 ≥ CrCl > 50 ml/min36 (31–41)62 (58–67)21 (15–27)34 (27–41)
50 ≥ CrCl > 40 ml/min39 (35–44)55 (51–59)30 (23–36)41 (33–50)
40 ≥ CrCl > 30 ml/min40 (34–46)59 (53–65)35 (27–43)37 (30–44)
30 ≥ CrCl > 20 ml/min46 (38–53)47 (41–54)19 (11–26)44 (33–55)
CrCl ≤ 20 ml/min59 (43–76)47 (28–67)69 (59–80)44 (28–59