From: Mammographic density and survival in interval breast cancers
 | All | Nondense breasts | Dense breasts | Pvalue for interaction terma | ||||||
---|---|---|---|---|---|---|---|---|---|---|
 | HR | 95% CI | Pvalue | HR | 95% CI | Pvalue | HR | 95% CI | Pvalue |  |
Model 1b | 3.50 | 2.25 to 5.44 | <0.001 | 3.62 | 2.17 to 6.06 | <0.001 | 3.00 | 1.26 to 7.17 | 0.013 | 0.742 |
Main model (model 2)c | 2.17 | 1.36 to 3.47 | 0.001 | 2.43 | 1.44 to 4.10 | 0.001 | 1.41 | 0.53 to 3.74 | 0.486 | 0.304 |
Model 3d | 1.69 | 1.03 to 2.76 | 0.038 | 1.76 | 1.01 to 3.09 | 0.047 | 1.26 | 0.47 to 3.38 | 0.649 | 0.337 |