Table 2.

Correlations of aBMD, BMC and bone area with anthropometrics, perceived stress, physical activity, duration of previous oral contraceptive use, calcium/kcal intake, 24-hr urinary free cortisol excretion and 24-hr urine volume.

	Height (cm)	Weight (kg)	Lean Mass (kg)	Fat Mass (kg)	Waist Circ (cm)	PSS score	Total Activity score	Sport Activity score	Leisure Activity score	Prior OC usea	Calcium (mg/kcal)	UFC (μg/d)	Urine Volume (L)
Total body aBMD	0.38***	0.52***	0.58***	0.19*	0.35***	−0.27**	0.34***	0.40***	0.18*	0.18*	0.17t	−0.19*	0.13
Total body BMC	0.75***	0.79***	0.79***	0.42***	0.51***	−0.28***	0.36***	0.43***	0.17*	0.20*	0.23**	−0.17t	0.22*
Lumbar spine aBMD	0.38***	0.42***	0.47***	0.16t	0.24**	−0.21*	0.27**	0.30***	0.19*	0.13	0.18*	−0.16t	0.11
Lumbar spine BMC	0.64***	0.57***	0.67***	0.21*	0.30***	−0.21*	0.32***	0.35***	0.23**	0.15t	0.21**	−0.13	0.19*
Lumbar spine area	0.75***	0.58***	0.70***	0.23**	0.30***	−0.15t	0.29***	0.30***	0.21*	0.15t	0.19*	−0.06	0.23**
Total hip aBMD	0.28***	0.39***	0.50***	0.09	0.25**	−0.27**	0.32***	0.40***	0.13	0.21*	0.19*	−0.10	0.19*
Total hip BMC	0.61***	0.60***	0.76***	0.17t	0.35***	−0.30***	0.42***	0.50***	0.18*	0.28***	0.25**	−0.12	0.26**
Total hip area	0.80***	0.62***	0.78***	0.20*	0.33***	−0.19*	0.37***	0.42***	0.18*	0.27**	0.21*	−0.09	0.27**

Waist Circ, circumference of narrowest point between lowest rib and iliac crest; PSS, Perceived Stress Scale; OC, oral contraceptive; UFC, 24-hr urinary free cortisol excretion; aBMD, areal bone mineral density (g/cm²); BMC, bone mineral content (g); area, bone area (cm²). Data are presented as Pearson’s (R) coefficients. Exact n varied by comparison as cases were excluded pairwise.

^tCorrelation approaches significance with p<0.10. Correlation is significant at:

^*p<0.05,

^**p<0.01,

^***p<0.001.

^aDuration of oral contraceptive use prior to the study (non users= 0)