Figure legends
Figure 1: Forest plot for odds of liveborn preterm birth in pandemic vs
historical period in the studied Regions. Unadjusted analysis.
Panel a: preterm birth - PTB (< 37 weeks’ GA); panel b: late
PTB (32-36 weeks’ GA); panel c: very PTB (< 32 weeks’ GA);
panel d: extremely PTB (< 28 weeks’ GA)
Cohort-specific and overall OR and 95% CI are shown; I-squared:
percentage of between-studies heterogeneity and relative P value; %
Weight: set of weights attributed to each cohort; pandemic and
historical events: number of preterm births over total live births in
the 2 periods
Figure 2. Interrupted time series regression. Each dot represents the
average monthly frequency of liveborn preterm births (< 37
weeks’ GA) over total births. Time starts at January
1st 2017. Solid
line: predicted trend based on the seasonally adjusted regression model.
Dashed line: de-seasonalized trend.
The date of implementation of mitigation measures (March
1st 2020) is shown as a vertical line.