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Table 5 Adjusted odds ratios from mulitvariate logistic regression model of factors predictive of induction of labour among Northern Territory women who birthed in 2001–2012 by Aboriginal status and induction of labour status

From: A retrospective population-based study of induction of labour trends and associated factors among aboriginal and non-aboriginal mothers in the northern territory between 2001 and 2012

 

Aboriginal

Non-Aboriginal

Characteristic

OR (95 % CI)

OR (95 % CI)

Year

1.04 (1.02, 1.05)

1.00 (0.99, 1.01)

Maternal age

  

 Less than 20 years

0.76 (0.73, 0.96)

1.00 (0.85, 1.19)

 20 to 24 years

0.84 (0.73, 0.96)

1.05 (0.96, 1.16)

 25 to 29 years

1.00

1.00

 30 to 34 years

1.12 (0.95, 1.31)

0.92 (0.85, 1.00)

 35 years and over

1.05 (0.86, 1.28)

0.90 (0.85, 1.01)

Marriage status

  

 Single

0.78 (0.71, 0.86)

1.08 (0.99, 1.18)

 Married/defacto

1.00

1.00

 Other

1.07 (0.86, 1.33)

0.97 (0.88, 1.07)

Parity

  

 First-time mother

1.19 (1.06, 1.33)

0.85 (0.80, 0.92)

 1–2 previous births

1.00

1.00

  ≥ 3 previous births

1.23 (1.09, 1.39)

1.37 (1.22, 1.54)

Place of birth

  

 Public hospital

1.00

1.00

 Private hospital

3.02 (1.94, 4.67)

3.12 (2.90, 3.35)

 Other

NAa

0.01 (0.00, 0.06)

Residence of mother

  

 Urban

1.00

1.00

 Remote

0.98 (0.89, 1.09)

1.02 (0.92, 1.12)

Medical and obstetric factorsb

  

 Multiple pregnancy

1.31 (0.76, 2.23)

1.36 (0.98, 1.87)

 Early antenatal visit

1.11 (1.01, 1.22)

1.15 (1.07, 1.24)

 Previous caesarean section

0.26 (0.22, 0.30)

0.14 (0.12, 0.16)

 Smoked during pregnancy

0.81 (0.74, 0.89)

1.11 (1.02, 1.22)

 Diabetes in pregnancy

3.49 (3.04, 4.02)

2.15 (1.90, 2.45)

 Maternal hypertension

4.27 (3.50, 5.21)

6.45 (5.32, 7.83)

 Pre-eclampsia

10.69 (9.01, 12.68)

9.78 (8.39, 11.41)

 Antepartum haemorrhage

1.34 (0.95, 1.91)

1.28 (1.03, 1.59)

 Malpresentation

0.17 (0.11, 0.25)

0.19 (0.15, 0.25)

 Preterm delivery

0.46 (0.38, 0.56)

0.32 (0.26, 0.39)

 Late term (≥41 weeks)

7.35 (6.48, 8.34)

6.16 (5.66, 6.71)

 Premature rupture of membranes

2.21 (1.68, 2.90)

2.65 (1.99, 3.54)

 Prolonged rupture of membranes

10.83 (9.15, 12.82)

13.11 (11.20, 15.35)

 Intrauterine growth retardation

1.22 (1.08, 1.38)

1.11 (0.99, 1.24)

 Macrosomia

1.19 (1.01, 1.40)

1.26 (1.15, 1.39)

  1. aOdds ratio not applicable as there were no cases among induced mothers
  2. bMedical and obstetric factors compared mothers with the factor to those without the factor