Table 1.

Characteristics of study subjects at baseline

Variable	Mean (standard deviation)	5th and 95th quantile
Age (yr)	70.4 (4.1)	66, 82
Weight (kg)	80.5 (12.3)	63, 102
Height (cm)	173.7 (6.4)	162, 183
Body mass index (kg/m2)	26.6 (3.4)	22.3, 34.3
sPINP(μg/L)	39.8 (13.1)	22.8, 67.1
sICTP (μg/L)	4.2 (1.1)	2.9, 6.8
Lumbar spine BMD (g/cm2)	1.29 (0.21)	0.98, 1.68
Femoral neck BMD (g/cm2)	0.95 (0.13)	0.73, 1.15
Duration of follow-up (yrs)	5.9 (1.5)	4.0, 8.9

sICTP, serum C-terminal telopeptide of type I collagen; sPINP, serum N-terminal propeptide of type I collagen; BMD bone mineral density.