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Table 2 Odds ratios of adverse birth outcomes after appendectomy before pregnancy

From: Appendectomy, cholecystectomy and diagnostic laparoscopy conducted before pregnancy and risk of adverse birth outcomes: a nationwide registry-based prevalence study 1996–2015

Outcome

Months from appendectomy to LMP

Appendectomy 0–11 months before LMP

Appendectomy 12–23 months before LMP

 

0–11

12–23

24+

 

N (%)

N (%)

N (%)

cOR (95% CI)

aOR* (95% CI)

cOR (95% CI)

aOR* (95% CI)

SGA

37/1694 (2.2)

51/1602 (3.2)

279/12643 (2.2)

0.99 (0.70;1.41)

0.92 (0.65;1.31)

1.47 (1.09;1.99)

1.37 (1.00;1.86)

Preterm

 Early preterm

12/1694 (0.7)

8/1602 (0.5)

97/12643 (0.8)

0.92 (0.51;1.68)

0.88 (0.48;1.61)

0.65 (0.32;1.34)

0.61 (0.29;1.26)

 Late preterm

82/1694 (4.8)

70/1602 (4.4)

599/12643 (4.7)

1.02 (0.81;1.30)

0.98 (0.77;1.24)

0.92 (0.71;1.18)

0.86 (0.67;1.11)

Miscarriage

96/1694 (5.7)

100/1602 (6.2)

677/12643 (5.4)

1.06 (0.85;1.32)

1.13 (0.90;1.40)

1.18 (0.95;1.46)

1.27 (1.02;1.58)

  1. *Adjusted for smoking status and maternal age, miscarriage only adjusted for maternal age
  2. Legend: Prevalence, crude and adjusted odds ratios (cOR/aOR) of small for gestational age (SGA), early preterm birth, late preterm birth and miscarriage in pregnancies with appendectomy before pregnancy