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We examined pregnancy outcomes in New York City (NYC) and upstate New York after the September 11, 2001 World Trade Center disaster.

Using birth certificate data for NY residents (n = 1660,401 births), we estimated risk of low birthweight (LBW: <2500 g) and preterm birth (<37 weeks) one week after September 11th versus three weeks before, and for 10 four-week intervals post-disaster versus these intervals in the two previous years. To corroborate regression results, we used time-series analysis.

One week after September 11th in NYC, we observed an adjusted odds of 1.44 for births <1500 g (P = 0.07) and 1.67 for births 1500–1999 g (P = 0.01), but a decreased odds of 2000–2499 g. We found no immediate change in LBW upstate or preterm in either location. In extended analyses, we found, in both …