Table 6.

Serum calcium (Ca), osteocalcin (OC), and CTx concentrations

	Reference values	Cluster
		I (n = 42)	II (n = 21)	III (n = 8)	IV (n = 14)
Serum Ca (mg/l)
X ± SD		102 ± 6.3 a, b	99.7 ± 9.0 a	104 ± 6.4 a, b	106 ± 5.7 b
Median		103	99.5	105	105
Range	85–105a	86.6–116	82.1–115	91.1–111	97.4–116
Serum OC (ng/ml)
X ± SD	17.9 ± 6.5 b	26.8 ± 10.9	30.0 ± 16.3	34.6 ± 15.8	25.2 ± 9.3
Median		23.8	25.3	32.6	23.6
Range		12.1–57.2	9.9–71.6	9.6–63.8	9.7–46.1
Serum CTx (ng/ml)
X ± SD		0.71 ± 0.28	0.76 ± 0.45	0.93 ± 0.37	0.81 ± 0.26
Median	0.287	0.69	0.66	0.82	0.76
Range	0.112–0.738c	0.23–1.77	0.10–1.90	0.50–1.64	0.38–1.25

Values in rows not sharing a common letter are significantly different (p < 0.05)

X ± SD arithmetic mean ± standard deviation

^aFrom reference [19]

^bReference values for premenopausal women (kit leaflet)

^cReference values for premenopausal women (geometric mean and 95% CI; kit leaflet)