Table 4.
Summary of interactions between parity and the introduction and withdrawal of the Health in Pregnancy Grant, model coefficients (95% CI)
| Model variable | Mean gestational age booking | Proportion booking by 10 weeks | Proportion booking by 18 weeks | Proportion booking by 25 weeks | Proportion of babies that were SGA |
| Time | 0.03 (−0.01 to 0.08) | −0.0002 (−0.001 to 0.0004)* | −0.0002 (−0.0004 to 0.00001) | −0.0001 (−0.0003 to 0.00007) | −0.00002 (−0.0003 to 0.0003) |
| Parity >0 vs 0 | 0.09 (−2.54 to 2.72) | −0.04 (−0.09 to −0.003)† | 0.008 (−0.006 to 0.02) | 0.01 (−0.001 to 0.02) | −0.004 (−0.02 to 0.02) |
| Parity × time | −0.02 (−0.08 to 0.04) | 0.0005 (−0.0005 to 0.001) | 0.0002 (−0.002 to 0.002) | 0.00005 (−0.0002 to 0.0003) | −0.00002 (−0.0005 to 0.0004) |
| Level change at introduction | 5.57 (1.62 to 9.51) | 0.01 (−0.05 to 0.07) | −0.04 (−0.06 to −0.01) | −0.04 (−0.05 to −0.02) | 0.01 (−0.02 to 0.04) |
| Trend change at introduction | −0.50 (−0.78 to −0.21) | 0.003 (−0.001 to 0.008) | 0.002 (0.001 to 0.004) | 0.003 (0.001 to 0.004) | −0.001 (−0.004 to 0.001) |
| Parity × level change at introduction | −0.61 (−6.19 to 4.97) | −0.04 (−0.13 to 0.04) | 0.007 (−0.02 to 0.04) | 0.007 (−0.02 to 0.03) | −0.01 (−0.06 to 0.03) |
| Parity × trend change at introduction | 0.01 (−0.39 to 0.41) | 0.0006 (−0.006 to 0.007) | −0.001 (−0.002 to 0.002) | −0.0002 (−0.002 to 0.002) | 0.002 (−0.002 to 0.005) |
| Level change at withdrawal | 1.03 (−3.16 to 5.22) | −0.02 (−0.08 to 0.05) | 0.005 (−0.02 to 0.03) | −0.01 (−0.03 to 0.001) | 0.02 (−0.04 to 0.02) |
| Trend change at withdrawal | 0.30 (−0.01 to 0.61) | −0.002 (−0.006 to 0.003) | −0.002 (−0.003 to −0.00) | −0.002 (−0.003 to 0.001) | 0.001 (−0.002 to 0.003) |
| Parity × level change at withdrawal | −0.13 (−5.80 to 6.06) | 0.006 (−0.09 to 0.10) | −0.003 (−0.04 to 0.03) | 0.001 (−0.03 to 0.03) | −0.03 (−0.07 to 0.02) |
| Parity × trend change at withdrawal | 0.08 (−0.36 to 0.52) | −0.001 (−0.008 to 0.006) | −0.001 (−0.003 to 0.002) | −0.001 (−0.002 to 0.002) | −0.001 (−0.004 to 0.003) |
*Values are given to two decimal places or, for values <0.1, one significant figure.
†Bold indicates where 95% CIs do not cross 0.
SGA, small for gestational age.