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.