Table 3. Association between bone mass classification using calcaneal ultrasound and calcium and caffeine intake in a population of perimenopausal women in Southern Brazil, 2010; median and interquartile range (IQR).

	Bone mass classification				P-value
Variables	Normal		Low
	Median	IQR	Median	IQR
Calcium (mg/day)	535.98	261.93 - 862.21	604.55	279.71 - 889.71	0.860
Caffeine (mg/day)	108.00	64.13 - 179.15	107.50	55.71 - 162.00	0.694