Risk of being born small for gestational age (birth weight <10th percentile for gestational age) by partner’s employment status in the University Hospital Southampton maternity population-based cohort (singleton live births 2004–2016)
| Mothers with an unemployed partner | |||
| OR | 99% CI | P value | |
| Unadjusted risk | 1.68 | 1.51 to 1.88 | <0.001 |
| Adjusted risk—model 1 | 1.69 | 1.51 to 1.90 | <0.001 |
| Adjusted risk—model 2 | 1.48 | 1.31 to 1.66 | <0.001 |
| Adjusted risk—model 3 | 1.49 | 1.33 to 1.67 | <0.001 |
| Adjusted risk—model 4 | 1.27 | 1.13 to 1.43 | <0.001 |
Model 1 adjusts for maternal age, ethnicity, parity, gestational diabetes and systolic blood pressure.
Model 2 is model 1 plus the other two socioeconomic status indicators (n births=60 385, n mothers=41 841).
Model 3 is model 2 plus maternal body mass index as a potential mediator (n births=60 385, n mothers=41 841).
Model 4 is model 3 plus maternal smoking history as an additional mediator (n births=60 385, n mothers=41 841).
In all models, the SEs are adjusted for multiple births per mother.