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