Table 1.
Parameter estimates from the MCMC models built using IFS data
| Association with smoking ever during pregnancy | Association with smoking at delivery | |||
|---|---|---|---|---|
| β (SE) | OR (95 % CI) | β (SE) | OR (95 % CI) | |
| Age group (baseline = 30+ years) | ||||
| 25–29 | 0.500 (0.075) | 1.73 (1.50–2.01) | 0.366 (0.104) | 1.44 (1.18–1.77) |
| 20–24 | 1.132 (0.095) | 3.10 (2.57–3.74) | 0.967 (0.117) | 2.63 (2.09–3.31) |
| Under 20 | 1.647 (0.176) | 5.19 (3.68–7.33) | 1.445 (0.194) | 4.24 (2.90–6.20) |
| Quintile of Index of Multiple Deprivation (baseline = 1 most deprived) | ||||
| 2 | −0.254 (0.089) | 0.78 (0.65–0.92) | −0.446 (0.110) | 0.64 (0.52–0.79) |
| 3 | −0.496 (0.096) | 0.61 (0.50–0.74) | −0.765 (0.125) | 0.47 (0.36–0.59) |
| 4 | −0.582 (0.110) | 0.56 (0.45–0.69) | −1.076 (0.157) | 0.34 (0.25–0.46) |
| 5 (least deprived) | −1.025 (0.123) | 0.36 (0.28–0.46) | −1.713 (0.193) | 0.18 (0.12–0.26) |
| Individual-level interactions | ||||
| 20–24 X IMDQ4 | 0.652 (0.226) | 1.92 (1.23–2.99) | 0.848 (0.278) | 2.33 (1.35–4.03) |
| 20–24 X IMDQ5 | 1.017 (0.253) | 2.76 (1.68–4.54) | 1.078 (0.346) | 2.94 (1.49–5.79) |
| <20 X IMDQ3 | 1.379 (0.573) | 3.97 (1.29–12.2) | 1.150 (0.507) | 3.16 (1.17–8.53) |
| <20 X IMDQ4a | 0.730 (0.461) | 2.08 (0.84–5.12) | 0.713 (0.499) | 2.04 (0.77–5.43) |
| <20 X IMDQ5 | 1.577 (0.665) | 4.84 (1.31–17.8) | 2.589 (0.651) | 13.3 (3.72–47.7) |
| Area-level variables | ||||
| % females not of white or mixed ethnicity | −0.019 (0.002) | 0.98 (0.98–0.99) | −0.023 (0.003) | 0.98 (0.97–0.98) |
| Constant | −1.519 (0.076) | −2.054 (0.096) | ||
| Level 2 variance | 0.012 (0.012) | 0.017 (0.020) | ||
aParameter retained in parsimonious model despite non-significance as the number of women in this strata was very small (n = 25), limiting power. All other excluded interaction parameters were highly non-significant