Table 2. Reference ranges for serum erythropoietin (IU/L) levels per age group for subjects in the reference sample.

	Total (n = 2,506)
Age, y	N (%)	Median	95% reference ranges (P2.5–P97.5)
<40	602 (24.0)	6.9	3.1–16.5
40–50	839 (33.5)	7.2	3.1–14.7
50–60	639 (25.5)	7.3	3.3–15.9
60–70	309 (12.3)	7.6	2.8–17.1
>70	117 (4.7)	7.5	4.0–17.9