Table 2 Estimates of level and slope changes in main analysis of primary and secondary outcomes; SGA = small for gestational age, LBW = low birth weight; All values are rounded to the fourth decimal place.

From: Interrupted time series study found mixed effects of the impact of the Bavarian smoke-free legislation on pregnancy outcomes

Outcome

Rate ratio (95%CI)1 level change

Rate ratio (95%CI) slope change

Model type

Preterm birth

1.0163 (0.9762, 1.0580)

0.9995 (0.9976, 1.0013)

Negative binomial model with autocorrelation terms

SGA

1.0063 (0.9839, 1.0292)

1.0005 (0.9995, 1.0014)

Poisson model with seasonal dummies and autocorrelation terms

LBW

0.9861 (0.9484, 1.0254)

0.9983 (0.9966, 1.0000)

Negative Binomial with seasonal dummies

Very preterm birth

0.8960 (0.8413, 0.9542), p = 0.0006

0.9954 (0.9928,0.9982), p = 0.0010

Negative binomial model with autocorrelation terms

Stillbirth

0.9583 (0.8165,1.1247)

1.0004 (0.9936, 1.0073)

Poisson model

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