In work led by Robin Park (@ox.ac.uk), we used staggered difference-in-differences to examine the impact of reporting changes. These showed a sudden and drastic effect of the pregnancy checkbox on mortality as it was rolled out across states. 2/n
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And once we accounted for this effect, maternal mortality was flat...until COVID-19. Then, the change -- particularly during the Delta wave -- was real...and drastic, about doubling maternal mortality. 3/n
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So overall, amidst reasons for optimism with respect to trends, we shouldn't lose sight of work still to do. 4/n
@robbieparks.bsky.social +Seth Flaxman