Table 3.

Parathyroid Hormone Reference Ranges Shown by Age Decade for Black Study Subjects, White Study Subjects, and Both Collectively^*

	Black study subjects		White study subjects		Black + white study subjects
Age decade (yr)	No.	Reference range†	No.	Reference range†	No.	Reference range†
20–29	5	19.1–36.1	17	17.1–52.8	22	17.1–52.8
30–39	6	19.4–62.1	24	14.1–70.3	30	14.1–70.3
40–49	6	14.4–55.8	30	17.0–61.4	36	14.4–61.4
50–59	14	23.0–67.8	32	15.7–60.3	46	16.6–60.3
60–69	6	24.4–49.6	38	16.0–68.5	44	16.0–66.3
70–79	3	40.1–82.2	24	16.5–59.6	27	16.5–82.2
Overall (20–79)	40	16.7–74.9	165	16.5–60.3	205	16.5–62.1

^*Patients with Z-scores less than −2.0 were excluded; all patients had 25-hydroxyvitamin D values >50 nmol/L.

^†Reference ranges (pg/mL) refer to the 2.5 and 97.5 percentiles.