And for all the 1918 flu cohort studies that compare 1919 to all surrounding cohorts, including 1920, the water is doubly muddied: fertility patterns make it look like any compositional changes persisted into 1920, causing bias in the opposite direction too (2/2)
doi.org/10.1080/0032...
In 1919–20, the European countries that were neutral in the First World War saw a small baby bust followed by a small baby boom. The sparse literature on this topic attributes the 1919 bust to indi...
