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Table 5 Univariate Analysis of Pre-pregnancy Treatments associated with Placenta Previa in the Endometriosis group

From: Adverse effects of endometriosis on pregnancy: a case-control study

Pre-pregnancy treatments With placenta previa (N = 10) Without placenta previa (N = 70) Crude OR (95% CI)
Surgical treatment group 8 41 4.62 (2.11–10.10)
 Passed over 5 years at Pregnancy 3 12 5.92 (1.65–21.30)
Non-surgical treatment group 2 29 1.63 (0.19–6.59)
Total 10 70 3.38 (1.70–6.74)
  1. Crude OR was calculated using the control group as a reference. Among 31 patients in the non-surgical treatment group, 26 patients were diagnosed before pregnancy by ultrasound or MRI with ovarian endometriosis (n = 22), and symptoms (n = 4), and 5 patients were diagnosed with ovarian endometriosis in the 1st trimester of pregnancy by ultrasound. OR Odds Ratio, CI Confidence Interval