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Observed proportions of participants having achieved pregnancy within 12 cycles of trying by quartile (Q) of mitochondrial DNA copy number (mtDNAcn) with 95% CIs. Pregnancy proportions shown above are: Q1 = 0.82 (95% CI: 0.73, 0.89); Q2 = 0.75 (95% CI: 0.65, 0.83); Q3 = 0.68 (95% CI: 0.57, 0.77); and Q4 = 0.63 (95% CI: 0.53, 0.73). Cochran–Armitage P-trend = 0.002.
