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Table 4 Odds Ratios for Logistic Regression of Labour Induction: Multiparous Women

From: Socioeconomic risk factors for labour induction in the United Kingdom

 Model 1
N = 9293
Model 2
N = 8616
Odds Ratio95% CIp-valueOdds Ratio95% CIp-value
Maternal Age
 19 years and under0.8630.582, 1.2810.4660.9180.592, 1.4220.701
 20–25 years old0.9370.788, 1.1150.4660.9550.791, 1.1530.631
 26–30 years old0.9440.816, 1.0920.4400.9570.818, 1.1200.587
 31–35 years old0.9210.801, 1.0600.2530.9250.796, 1.0750.308
 36 years and olderRefRefRefRefRefRef
Maternal Ethnicity
 WhiteRefRefRefRefRefRef
 Indian1.0680.758, 1.5050.7081.3020.897, 1.8900.164
 Pakistani/Bangladeshi0.728*0.531, 0.9970.0480.7190.504, 1.0270.069
 Black/Black British0.7850.578, 1.0660.1210.8440.597, 1.1910.334
 Other0.8000.553, 1.1570.2360.8810.595, 1.3040.526
Maternal Marital Status
 Legally MarriedRefRefRefRefRefRef
 Cohabiting0.9960.878, 1.1300.9541.0250.894, 1.1750.722
 Unpartnered1.225*1.040, 1.4430.0151.246*1.044, 1.4860.015
Maternal Education
 Higher/first degreesRefRefRefRefRefRef
 Diplomas in higher education1.525***1.239, 1.8790.0001.522***1.220, 1.8990.000
 A/O Levels (GSCE A-C)1.477***1.255, 1.7370.0001.556***1.308, 1.8500.000
 Other (incl. GCSE D-G)1.397**1.133, 1.7240.0021.477**1.179, 1.8500.001
 None1.540***1.255, 1.8900.0001.791***1.436, 2.2330.000
Electoral Ward Deprivation
 England – AdvantagedRefRefRefRefRefRef
 England – Disadvantaged1.0450.909, 1.2010.5331.0570.911, 1.2270.466
 England – Ethnic0.9520.750, 1.2080.6840.9320.717, 1.2120.601
 Wales – Advantaged1.0500.832, 1.3250.6821.0110.790, 1.2930.933
 Wales – Disadvantaged1.1770.990, 1.4000.0651.1800.980, 1.4200.081
 Scotland – Advantaged1.326**1.087, 1.6170.0051.344*1.086, 1.6630.007
 Scotland – Disadvantaged1.411**1.156, 1.7230.0011.434**1.159, 1.7740.001
 N. Ireland – Advantaged1.952***1.566, 2.4340.0002.232***1.769, 2.8160.000
 N. Ireland – Disadvantaged1.989***1.649, 2.3990.0002.322***1.904, 2.8330.000
Pregnancy Complications
 No pregnancy complications   RefRefRef
 Complications not associated with induction   1.424***1.254, 1.6170.000
 Complications associated with induction   1.902***1.648, 2.1940.000
 Other   1.343*1.070, 1.6860.011
Maternal BMI
 Low (< 18.5)   RefRefRef
 Normal (18.5–24.9)   0.9090.709, 1.1660.452
 High (≥25.0)   1.0750.832, 1.3900.578
Infant Birth Weight
 Low (<2500 g)   1.340*1.049, 1.7110.167
 Normal (2500–4000 g)   RefRefRef
 High (>4000 g)   1.300***1.125, 1.5020.000
Infant Gestational Age
 259 days or less   1.0870.889, 1.3290.415
 260–272 days   1.241**1.081, 1.4240.002
 273–286 days   RefRefRef
 287–293 days   2.806***2.468, 3.1900.000
 294 days or more   5.443***4.213, 7.0320.000
  1. Model 1 was adjusted for maternal occupation, housing tenure, and income quintile
  2. Model 2 was adjusted for maternal occupation, housing tenure, income quintile, and smoking behaviour
  3. *P < 0.05 **P < 0.01 ***P < 0.001