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Table 4 Risk factors associated with miscarriage

From: Maternal hepatitis B virus carrier status and pregnancy outcomes: a prospective cohort study

  Cases/Exposed Crude OR (95 % CI) Adjusted OR (95 % CI)
Age
 <35 1067/19691 1 1
 ≥35 148/1313 2.22 (1.85–2.66) 1.17 (0.94–1.45)
Nulliparity
 No 830/15897 1 1
 Yes 385/5107 1.48 (1.31–1.69) 1.80 (1.54–2.11)
Education
 High school/under 497/8063 1  
 College/above 718/12941 0.83 (0.67–1.19)  
Pre-maternal BMI
 <25 1049/18331 1  
 ≥25 166/2673 1.09 (0.97–1.42)  
Previous abortion
 0 673/19063 1 1
 1 309/1371 7.95 (6.85–9.22) 9.33 (7.97–10.92)
 ≥2 233/570 18.89 (15.72–22.71) 23.36 (19.10–28.57)
HBV carrier
 No 1167/20491 1 1
 Yes 48/513 1.71 (1.26–2.31) 1.71 (1.23–2.38)
IVF
 No 1196/20853 1 1
 Yes 19/151 2.37 (1.46–3.84) 1.78 (1.03–3.05)
  1. Abbreviations: BMI body mass index, IVF in vitro fertilization