Lauren A Wise1, Ellen M Mikkelsen2, Henrik Toft Sørensen2, Kenneth J Rothman3, Kristen A Hahn4, Anders H Riis2, Elizabeth E Hatch4. 1. Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts; Slone Epidemiology Center, Boston University, Boston, Massachusetts. Electronic address: lwise@bu.edu. 2. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark. 3. Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts; RTI Health Solutions, Research Triangle Institute, Research Triangle Park, North Carolina. 4. Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts.
Abstract
OBJECTIVE: To investigate the association between time to pregnancy (TTP) and adverse birth outcomes. DESIGN: Prospective cohort study. SETTING: Not applicable. PATIENT(S): A total of 3,521 singletons born to women aged 18-40 years at cohort entry. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Selected birth outcomes, including preterm birth (PTB, <37 weeks' gestation), low birth weight (<2,500 g), small for gestational age, large for gestational age, and placental disorders, ascertained from the Danish Medical Birth Registry and Danish National Registry of Patients. Risk ratios (RRs) and 95% confidence intervals (CIs) were estimated using log-binomial regression, with adjustment for potential confounders and fertility treatment. RESULT(S): Multivariable RRs for PTB in relation to TTP of 3-5, 6-11, and ≥12 vs. <3 cycles were 1.59 (95% CI 0.94-2.69), 0.85 (95% CI 0.48-1.50), and 1.57 (95% CI 0.93-2.65). The association was slightly stronger for spontaneous PTB (TTP ≥12 vs. <3 cycles: RR 1.69, 95% CI 0.84-3.42) than for medically indicated PTB (RR 1.39, 95% CI 0.62-3.12). Longer TTPs (≥12 cycles) were associated with increased risks of low birth weight (RR 1.80, 95% CI 0.97-3.35), cesarean delivery (RR 1.64, 95% CI 1.27-2.12), placental disorders (RR 2.21, 95% CI 1.07-4.56), ischemic placental disease (RR 1.56, 95% CI 0.99-2.44), pre-eclampsia (RR 1.45, 95% CI 0.79-2.65), and postpartum hemorrhage (RR 1.58, CI 1.14-2.19), and decreased risks of macrosomia (≥4,500 g; RR 0.63, 95% CI 0.35-1.13) and large for gestational age (RR 0.76, 95% CI 0.58-1.00). Longer TTP showed little association with small for gestational age. CONCLUSION(S): In a prospective cohort study of Danish pregnancy planners, delayed conception was a marker for adverse birth outcomes, after accounting for fertility treatment.
OBJECTIVE: To investigate the association between time to pregnancy (TTP) and adverse birth outcomes. DESIGN: Prospective cohort study. SETTING: Not applicable. PATIENT(S): A total of 3,521 singletons born to women aged 18-40 years at cohort entry. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Selected birth outcomes, including preterm birth (PTB, <37 weeks' gestation), low birth weight (<2,500 g), small for gestational age, large for gestational age, and placental disorders, ascertained from the Danish Medical Birth Registry and Danish National Registry of Patients. Risk ratios (RRs) and 95% confidence intervals (CIs) were estimated using log-binomial regression, with adjustment for potential confounders and fertility treatment. RESULT(S): Multivariable RRs for PTB in relation to TTP of 3-5, 6-11, and ≥12 vs. <3 cycles were 1.59 (95% CI 0.94-2.69), 0.85 (95% CI 0.48-1.50), and 1.57 (95% CI 0.93-2.65). The association was slightly stronger for spontaneous PTB (TTP ≥12 vs. <3 cycles: RR 1.69, 95% CI 0.84-3.42) than for medically indicated PTB (RR 1.39, 95% CI 0.62-3.12). Longer TTPs (≥12 cycles) were associated with increased risks of low birth weight (RR 1.80, 95% CI 0.97-3.35), cesarean delivery (RR 1.64, 95% CI 1.27-2.12), placental disorders (RR 2.21, 95% CI 1.07-4.56), ischemic placental disease (RR 1.56, 95% CI 0.99-2.44), pre-eclampsia (RR 1.45, 95% CI 0.79-2.65), and postpartum hemorrhage (RR 1.58, CI 1.14-2.19), and decreased risks of macrosomia (≥4,500 g; RR 0.63, 95% CI 0.35-1.13) and large for gestational age (RR 0.76, 95% CI 0.58-1.00). Longer TTP showed little association with small for gestational age. CONCLUSION(S): In a prospective cohort study of Danish pregnancy planners, delayed conception was a marker for adverse birth outcomes, after accounting for fertility treatment.
Authors: Lauren A Wise; Laine Thomas; Sophia Anderson; Donna D Baird; Raymond M Anchan; Kathryn L Terry; Erica E Marsh; Ganesa Wegienka; Wanda Kay Nicholson; Kedra Wallace; Robert Bigelow; James Spies; George L Maxwell; Vanessa Jacoby; Evan R Myers; Elizabeth A Stewart Journal: Fertil Steril Date: 2022-02-23 Impact factor: 7.490
Authors: Alison E Hipwell; Linda G Kahn; Pam Factor-Litvak; Christina A Porucznik; Eva L Siegel; Raina N Fichorova; Richard F Hamman; Michele Klein-Fedyshin; Kim G Harley Journal: Hum Reprod Update Date: 2019-01-01 Impact factor: 15.610