Distribution of mtDNA copy number among subgroups of PCa patients stratified by different levels of clinicopathological characteristics.

Abbreviations: mtDNA  =  mitochondrial DNA; PCa  =  prostate cancer; OR  =  odds ratio; CI  =  confidence intervals; PSA  =  prostate-specific antigen; AJCC  =  American Joint Committee on Cancer.
amtDNA copy number was grouped based on the median mtDNA copy number in controls.
bAnalyses were performed using unconditional models adjusted for age, PSA level, AJCC stage and Gleason score where appropriate.
cData of AJCC stage were classified by the 7th AJCC staging system; data were not available for 3 cases.
dData of Gleason score were not available for 4 cases.
Distribution of mtDNA copy number among subgroups of PCa patients stratified by different levels of clinicopathological characteristics.