American Journal of Epidemiology Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health 2015. This work is written by (a) US Government employee(s) and is in the public domain in the US.
Vol. 182, No. 2 DOI: 10.1093/aje/kwv032 Advance Access publication: June 1, 2015
Original Contribution Differences in Risk Factors for Recurrent Versus Incident Preterm Delivery
Katherine L. Grantz*, Stefanie N. Hinkle, Pauline Mendola, Lindsey A. Sjaarda, Kira Leishear, and Paul S. Albert
Initially submitted May 15, 2014; accepted for publication January 27, 2015.
Risk factors for preterm delivery have been described, but whether risk factors differ in the context of prior preterm delivery history is less understood. We assessed whether known risk factors were different in women with versus without prior preterm delivery using medical records of the first and second singleton deliveries in 25,820 Utah women (2002–2010). Longitudinal transition models with modified Poisson regression calculated adjusted relative risks and 95% confidence intervals, with multiplicative interactions between each preterm risk factor and prior preterm delivery status to explore whether risk factors varied between incident and recurrent preterm delivery at
Vol. 182, No. 2 DOI: 10.1093/aje/kwv032 Advance Access publication: June 1, 2015
Original Contribution Differences in Risk Factors for Recurrent Versus Incident Preterm Delivery
Katherine L. Grantz*, Stefanie N. Hinkle, Pauline Mendola, Lindsey A. Sjaarda, Kira Leishear, and Paul S. Albert
Initially submitted May 15, 2014; accepted for publication January 27, 2015.
Risk factors for preterm delivery have been described, but whether risk factors differ in the context of prior preterm delivery history is less understood. We assessed whether known risk factors were different in women with versus without prior preterm delivery using medical records of the first and second singleton deliveries in 25,820 Utah women (2002–2010). Longitudinal transition models with modified Poisson regression calculated adjusted relative risks and 95% confidence intervals, with multiplicative interactions between each preterm risk factor and prior preterm delivery status to explore whether risk factors varied between incident and recurrent preterm delivery at
