Table 2.

Reference values of serum BTM levels in males by ascending age in 10-year cohorts. The preferred reference cohort is the one in which the age of the individual is most equal to the mean age of the reference cohort.

sCTX (pg/mL)			OC (ng/mL)			PINP (ng/mL)			BALP (U/L)
Age	N	Mean ± SD	Age	N	Mean ± SD	Age	N	Mean ± SD	Age	N	Mean ± SD
20–25	13	384.7 ± 155.0				20–25	10	77.8 ± 28.9	20–25	13	19.3 ± 4.1
20–30	21	375.4 ± 180.1	20–30	22	29.8 ± 8.5	20–30	24	66.3 ± 27.9	20–30	28	20.4 ± 5.0
25–40	15	314.0 ± 183.6	25–35	12	23.9 ± 9.1	25–35	21	58.8 ± 25.7	25–35	24	20.8 ± 6.3
30–50	23	247.1 ± 90.5	30–50	31	19.5 ± 5.8	30–40	19	51.4 ± 24.8	30–40	20	19.0 ± 6.6
35–55	27	241.9 ± 88.0	35–55	36	19.3 ± 5.5	35–45	24	42.0 ± 18.0	35–45	25	17.5 ± 4.9
40–60	31	225.5 ± 81.5	40–60	40	18.5 ± 4.9	40–50	24	37.6 ± 15.9	40–50	32	16.3 ± 4.4
45–65	27	197.6 ± 74.7	45–65	34	17.7 ± 4.2	45–55	32	37.5 ± 15.3	45–55	38	17.2 ± 5.5
50–70	19	194.3 ± 79.0	50–70	22	16.7 ± 3.4	50–60	42	36.9 ± 12.9	50–60	41	18.9 ± 6.3
						55–65	36	36.1 ± 12.4	55–65	27	19.6 ± 6.5
						60–70	21	35.2 ± 11.0	55–70	21	19.4 ± 6.4