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Table 3 Logistic regression analyses: association between maternal BMI, socio-demographic variables, and trimester at booking

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

  Second Trimester* Third Trimester*
OR (95% CI) aOR (95% CI) OR (95% CI) aOR (95% CI)
BMI Group
 Recommended Reference group
 Underweight 0.89 (0.87, 0.92) 0.79 (0.76, 0.83) 0.79 (0.73, 0.86) 0.73 (0.66, 0.81)
 Overweight 1.09 (1.08, 1.11) 1.07 (1.05, 1.08) 1.49 (1.45, 1.53) 1.39 (1.34, 1.44)
 Obese 1.05 (1.03, 1.06) 1.00 (0.98, 1.02) 1.52 (1.47, 1.57) 1.42 (1.36, 1.48)
Teenage pregnancy
 No Reference group
 Yes 1.39 (1.34, 1.45) 1.42 (1.33, 1.51) 1.74 (1.62, 1.86) 1.30 (1.13, 1.49)
Parity
 0 Reference group
 1 1.03 (1.02, 1.04) 1.06 (1.04, 1.08) 0.81 (0.79, 0.84) 0.75 (0.72, 0.78)
 2 1.11 (1.10, 1.13) 1.17 (1.14, 1.19) 0.82 (0.79, 0.85) 0.70 (0.67, 0.74)
 3+ 1.35 (1.32, 1.37) 1.36 (1.32, 1.39) 1.06 (1.01, 1.10) 0.85 (0.80, 0.89)
Ethnicity
 White Reference group
 South Asian or Asian British 2.38 (2.34, 2.43) 2.55 (2.49, 2.62) 1.81 (1.73, 1.88) 1.94 (1.83, 2.06)
 Black or Black British 3.03 (2.94, 3.12) 2.92 (2.81, 3.04) 4.87 (4.64, 5.10) 5.07 (4.76, 5.40)
 Chinese or Other Ethnic Group 1.68 (1.61, 1.74) 1.70 (1.62, 1.79) 2.72 (2.54, 2.91) 2.78 (2.54, 3.04)
 Mixed 1.40 (1.33, 1.48) 1.45 (1.36, 1.54) 1.74 (1.57, 1.94) 1.81 (1.58, 2.06)
Employment
 Employed Reference group
 Higher Education 1.89 (1.80, 1.98) 1.37 (1.30, 1.44) 2.31 (2.11, 2.54) 1.56 (1.40, 1.75)
 Housewife/ Carer 1.55 (1.52, 1.57) 1.18 (1.15, 1.20) 1.78 (1.72, 1.85) 1.93 (1.85, 2.01)
 Not Employed 1.46 (1.43, 1.49) 1.22 (1.20, 1.25) 2.08 (1.99, 2.17) 2.00 (1.91, 2.10)
 School Age/ Education under 18 years 1.88 (1.78, 2.00) 1.36 (1.24, 1.49) 3.02 (2.72, 3.36) 2.58 (2.15, 3.10)
IMD Quintile
 5-Least deprived Reference group
 4 1.00 (0.98, 1.01) 0.98 (0.96, 1.01) 0.93 (0.90, 0.97) 0.89 (0.85, 0.94)
 3 1.16 (1.14, 1.18) 1.05 (1.02, 1.07) 1.02 (0.99, 1.06) 0.88 (0.83, 0.92)
 2 1.42 (1.40, 1.44) 1.14 (1.12, 1.17) 1.26 (1.22, 1.31) 0.87 (0.82, 0.92)
 1- Most deprived 1.59 (1.57, 1.62) 1.30 (1.28, 1.34) 1.24 (1.20, 1.29) 0.72 (0.69, 0.76)
  1. * Trimester at booking compared with the reference group first trimester
  2. Abbreviations: OR odds ratio, CI confidence interval, aOR adjusted odds ratio, IMD Index of Multiple Deprivation, BMI body mass index