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Table 3 Factors associated with placenta accreta spectrum: results from univariate and logistic regression analyses

From: Risk factors for placenta accreta spectrum: findings from the Japan environment and Children’s study

VariableUnivariate analysisMultivariate analysis
OR95% CIP valueaOR95% CIP value
Placenta previa17.1310.48–28.01< 0.00112.867.70–21.45< 0.001
ART pregnancy8.025.64–11.39< 0.0016.784.54–10.14< 0.001
Maternal smoking status
 Never smokerRefRef
 Quit smoking during early pregnancy0.740.46–1.170.1930.830.51–1.350.452
 Smoking during pregnancy1.831.11–3.010.0171.951.15–3.310.013
Number of previous CSs
 0RefRef
 10.950.54–1.660.8500.870.49–1.530.618
 ≥ 22.491.36–4.590.0032.511.35–4.670.004
Uterine anomaly5.311.69–16.700.0043.971.24–12.680.020
Adenomyosis3.050.76–12.350.1181.770.41–7.520.442
Endometriosis1.670.93–2.990.0870.810.42–1.550.525
Uterine myoma1.520.93–2.460.0921.020.61–1.690.951
Maternal age
 ≤ 19 years1.210.30–4.870.7921.680.38–7.480.494
 20–24 yearsRefRef
 25–29 years0.730.52–1.020.0621.050.56–1.960.878
 30–34 years0.860.64–1.160.3331.060.58–1.950.848
 35–39 years1.461.08–1.980.0141.230.66–2.300.516
 ≥ 40 years2.051.27–3.340.0041.410.66–3.010.373
Number of IAs
 0RefRef
 11.170.78–1.760.4421.300.85–1.970.224
 ≥ 21.320.72–2.430.3691.290.68–2.450.433
  1. ART Assisted reproductive technology, IA Induced abortion, OR Odds ratio, CI Confidence interval, aOR Adjusted odds ratio, Ref Reference, CS Cesarean section