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Table 1 Parameter estimates from the MCMC models built using IFS data

From: Small area synthetic estimates of smoking prevalence during pregnancy in England

  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)  
  1. 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