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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
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