From: Mitochondrial DNA copy number variation, leukocyte telomere length, and breast cancer risk in the European Prospective Investigation into Cancer and Nutrition (EPIC) study
Stratum
Controls
Cases
OR
95% CI
p value
Overall
522
548
1.20
(1.05–1.37)
0.009
ER+
245
1.18
(0.96–1.45)
0.11
ER−
258
1.16
(0.98–1.38)
0.09