From: High mammographic density in women of Ashkenazi Jewish descent
 | Univariate analyses | Multivariate analysis | ||
---|---|---|---|---|
 | Odds ratio (95% confidence interval) | Pvalue | Odds ratio (95% confidence interval) | Pvalue |
First principal component | 2.00 (1.26 to 3.17) | 0.003 | 2.22 (1.36 to 3.65) | 0.002 |
Body mass index | Â | Â | Â | Â |
   First quartile (<21 kg/m2) | Reference |  | Reference |  |
   Second quartile (21 to 23 kg/m2) | 0.41 (0.28 to 0.59) | <0.001 | 0.38 (0.26 to 0.57) | <0.001 |
   Third quartile (23 to 26 kg/m2) | 0.33 (0.23 to 0.49) | <0.001 | 0.31 (0.21 to 0.46) | <0.001 |
   Fourth quartile (>26 kg/m2) | 0.44 (0.30 to 0.63) | <0.001 | 0.48 (0.32 to 0.71) | <0.001 |
Age at first live birth | Â | Â | Â | Â |
   <30 years | Reference |  | Reference |  |
   ≥30 years or nulliparous | 1.27 (0.93 to 1.72) | 0.1 | 1.13 (0.80 to 1.59) | 0.5 |
Menopausal status | Â | Â | Â | Â |
   Premenopausal | Reference |  | Reference |  |
   Postmenopausal | 0.67 (0.50 to 0.90) | 0.009 | 0.67 (0.49 to 0.92) | 0.01 |
   Postmenopausal on hormone therapy | 0.72 (0.49 to 1.06) | 0.1 | 0.74 (0.49 to 1.10) | 0.1 |