Pre-pregnancy Body Mass Index (BMI) and delivery outcomes in a Canadian population

Table 3 Multivariable logistic regression for labour induction

Risk factors for labour induction ¹	OR; 95% CI	aOR; 95% CI
Maternal age
≥35 years old	1.1; 0.9-1.4	1.2; 0.9-1.5
<35 years old	1.0	1.0
Pre-existent medical conditions²
Yes	1.4; (1.1-1.9)*	1.1; 0.8-1.5
No	1.0	1.0
Parity
Multiparity	0.5; (0.4-0.6)**	0.5; 0.4-0.7**
Primiparity	1.0	1.0
Pregnancy complications³
Yes	8.3; (6.4-10.9)**	7.3; 5.6-9.7**
No	1.0	1.0
Fertility treatments⁴
Yes	2.0; (1.4-2.9)**	1.4; 0.9-2.2
No	1.0	1.0
Pre-pregnancy BMI
Overweight	1.6; (1.2-2.0)**	1.3; 1.0-1.7*
Obese	2.3; (1.7-3.2)**	1.8; 1.3-2.5*
Normal weight	1.0	1.0

Abbreviations: OR unadjusted odd s ratio, aOR adjusted odds ratio, CI confidence interval, C-section caesarean section, BMI body mass index.
¹Reference category: spontaneous labour.
²Pre-existing diabetes mellitus, hypertension, chronic heart disease, chronic renal diseases.
³Gestational diabetes, preeclampsia, eclampsia, placental abruption, placenta praevia, prolonged rupture of membrane, IUGR.
⁴Includes achieving the pregnancy through fertility enhancing drugs, artificial insemination and artificial reproductive techniques (in vitro fertilization, intracytoplasmic sperm injection, fresh and donor embrio transfer etc.).
*p < 0.05; **p < 0.001.

ISSN: 1471-2393