. Author manuscript; available in PMC: 2016 Feb 26.

Published in final edited form as: J Bone Miner Res. 2010 Jan;25(1):14–19. doi: 10.1359/jbmr.090701

Table 1. Characteristics of the 424 mothers.

	Median	Inter-quartile range	n
Age at delivery (years)	31.7	28.7-33.9	424
Height (cm)	164	159-168	422
Pre-pregnancy sum of skin-fold thickness (mm)	63.9	48.7-82.8	419
Pre-pregnancy body mass index (BMI) (kg/m²)	23.9	21.5-26.4	422
34 week vitamin D concentration (nmol/L)	61	41-85	424
	Percentage
Smoking status : smokers (pre-pregnancy)	26.4
smokers (early pregnancy)	14.3
smokers in late pregnancy	13.6
Parity : nulliparous (first child)	59.4
In receipt of benefits:	13.7
Ethnic origin: white	97.4