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Table 2 Logistic regression analyses: association between maternal BMI, socio-demographic variables, and late booking (13+6 weeks)

From: Maternal body mass index and access to antenatal care: a retrospective analysis of 619,502 births in England

  Unadjusted OR (95% CI) Adjusted OR (95% CI)
BMI Group
 Recommended Reference group  
 Underweight 0.87 (0.85, 0.90) 0.77 (0.74, 0.81)
 Overweight 1.15 (1.14, 1.17) 1.11 (1.09, 1.12)
 Obese 1.13 (1.11, 1.14) 1.04 (1.02, 1.06)
Teenage pregnancy
 No Reference group  
 Yes 1.48 (1.43, 1.53) 1.43 (1.34, 1.53)
Parity
 0 Reference group  
 1 1.00 (0.99, 1.02) 1.01 (0.99, 1.03)
 2 1.09 (1.07, 1.10) 1.11 (1.08, 1.13)
 3+ 1.34 (1.32, 1.36) 1.28 (1.25, 1.31)
Ethnicity
 White Reference group  
 South Asian or Asian British 2.30 (2.26, 2.34) 2.32 (2.27, 2.39)
 Black or Black British 3.11 (3.03, 3.20) 2.92 (2.82, 3.03)
 Chinese or Other Ethnic Group 1.76 (1.70, 1.83) 1.76 (1.67, 1.85)
 Mixed 1.45 (1.38, 1.53) 1.48 (1.39, 1.58)
Employment
 Employed Reference group  
 Higher Education 1.94 (1.86, 2.03) 1.39 (1.32, 1.46)
 Housewife/ Carer 1.66 (1.63, 1.69) 1.31 (1.29, 1.33)
 Not Employed 1.55 (1.52, 1.59) 1.31 (1.28, 1.34)
 School Age/ Education under 18 years 2.13 (2.02, 2.25) 1.53 (1.40, 1.67)
IMD Quintile
 5-Least deprived Reference group  
 4 1.02 (1.00, 1.04) 0.99 (0.97, 1.02)
 3 1.19 (1.17, 1.21) 1.05 (1.02, 1.07)
 2 1.45 (1.43, 1.48) 1.12 (1.10, 1.15)
 1- Most deprived 1.67 (1.64, 1.69) 1.29 (1.26, 1.32)
  1. Abbreviations: OR odds ratio, CI confidence interval, IMD Index of Multiple Deprivation, BMI body mass index