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Table 2 Odds ratio (OR) and 95 % confidence interval (CI) for placental abruption in relation to categories of placental mitochondrial DNA copy number

From: Placental mitochondrial DNA content and placental abruption: a pilot study

Placental mitochondrial DNA copy number Placental abruption cases (N = 103) Controls (N = 102) Adjusted ORa (95 %CI)
Quartile 1 (<86.5) 22 (21.4) 26 (25.5) 1.00 (reference)
Quartile 2 (86.5–120.4) 17 (16.5) 25 (24.5) 0.72 (0.22–2.35)
Quartile 3 (120.5–191.4) 27 (26.2) 25 (24.5) 1.91 (0.66–5.52)
Quartile 4 (≥191.5) 37 (35.9) 26 (25.5) 2.15 (0.74–6.21)
P-value for linear trend    0.05
 <Median (<120.5) 39 (37.9) 51 (50.0) 1.00 (reference)
 ≥Median (≥120.5) 64 (62.1) 51 (50.0) 2.38 (1.11–5.08)
  1. aAdjusted for maternal pre-pregnancy body mass index, employed during pregnancy and gestational age at delivery