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