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 | 0.11 (0.03 to 0.19)* | −0.001 (−0.003 to 0.001) | −0.001 (−0.001 to −0.001) | −0.0004 (−0.001 to 0.00003)† | 0.0003 (−0.0003 to 0.001) |
Deprivation tertile | 4.53 (2.90 to 6.15) | −0.09 (−0.13 to −0.05) | −0.02 (−0.03 to −0.001) | −0.005 (−0.01 to 0.003) | 0.04 (0.03 to 0.05) |
Deprivation × time | −0.04 (−0.07 to −0.00) | 0.0004 (−0.0004 to 0.001) | 0.0002 (−0.0001 to 0.0004) | 0.0001 (−0.0001 to 0.003) | −0.0001 (−0.0004 to 0.0001) |
Level change at introduction | 17.18 (9.55 to 24.81) | −0.06 (−0.17 to 0.06) | −0.09 (−0.14 to −0.05) | −0.10 (−0.13 to −0.06) | 0.01 (−0.05 to 0.07) |
Trend change at introduction | −1.04 (−1.59 to −0.49) | 0.005 (−0.003 to 0.01) | 0.004 (0.001 to 0.007) | 0.005 (0.002 to 0.008) | −0.001 (−0.005 to 0.003) |
Deprivation × level change at introduction | −5.02 (−8.56 to −1.49) | 0.007 (−0.05 to 0.06) | 0.03 (0.004 to 0.05) | 0.03 (0.01 to 0.04) | −0.001 (−0.03 to 0.03) |
Deprivation × trend change at introduction | 0.22 (−0.03 to 0.47) | −0.0003 (−0.004 to 0.004) | −0.001 (−0.002 to 0.001) | −0.001 (−0.002 to −0.0002) | -0.00001 (−0.002 to 0.002) |
Level change at withdrawal | 6.47 (−1.68 to 14.62) | −0.06 (−0.18 to 0.06) | −0.008 (−0.06 to 0.04) | −0.03 (−0.07 to 0.01) | 0.02 (−0.04 to 0.08) |
Trend change at withdrawal | 0.59 (−0.005 to 1.18) | −0.002 (−0.01 to 0.01) | −0.002 (−0.006 to 0.001) | −0.003 (−0.006 to −0.00002) | −0.001 (−0.006 to 0.003) |
Deprivation × level change at withdrawal | −2.10 (−5.88 to 1.67) | 0.01 (−0.04 to 0.07) | 0.004 (−0.02 to 0.03) | 0.008 (−0.01 to 0.03) | −0.003 (−0.03 to 0.03) |
Deprivation × trend change at withdrawal | −0.10 (−0.37 to 0.18) | −0.00 (−0.005 to 0.005) | 0.00001 (−0.002 to 0.002) | 0.0004 (−0.001 to 0.002) | 0.001 (−0.001 to 0.003) |
*Bold indicates where 95% confidence intervals do not cross 0.
†values are given to two decimal places or, for values<0.1, one significant figure.
SGA, small for gestational age