Why the strictly alternating up-down pattern in the black line data? Seems to be year boundary and midyear, with one always higher than the other. Is this real or some phenomenon of the reporting?
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There is seasonality in outcomes like preterm birth and low birthweight. Lots of potential reasons studied in the literature-- seasonal infections, temperature, vitamin d, etc. Also some studies have shown socioeconomic variation in who gets pregnant throughout year.
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