Table 2.

Comparison of strain ratios between pre- and post-menopausal women

	Premenopausal	n	Postmenopausal	n	P
Controls
Strain ratio, mean (SD)	0.42 (0.14)	18	0.54 (0.17)	5	0.131
Minimum-maximum	0.20-0.70		0.32-0.68
Cases
Strain ratio, mean (SD)	1.04 (0.65)	14	1.09 (0.71)	14	0.683
Minimum-maximum	0.13-2.34		0.14-2.96

SD: Standard deviation