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Published on: October 10, 2025
Paternal age and preterm birth in Italy, 1990 to 1998
Paola Astolfi1, Antonio De Pasquale, Laura Attinia Zonta
1Department of Genetics and Microbiology, A. Buzzati-Traverso, University of Pavia, Pavia, Italy. astolfi@ipvgen.unipv.it
Insights
Advanced paternal age increases the risk of preterm birth, especially very preterm births. This large study confirms paternal age as a significant factor in adverse pregnancy outcomes.
Area of Science:
- Reproductive Health
- Perinatal Epidemiology
- Maternal-Fetal Medicine
Background:
- Advanced paternal age is a growing concern in reproductive health.
- Previous studies suggest a link between paternal age and adverse pregnancy outcomes.
- The impact of paternal age on preterm birth requires further investigation.
Purpose of the Study:
- To investigate the association between advanced paternal age and preterm birth.
- To quantify the risk of overall, very, and moderate preterm births related to paternal age.
- To analyze a large national dataset for robust epidemiological insights.
Main Methods:
- Analysis of Italian singleton births from 1990-1998 (n=1,510,823).
- Logistic regression models adjusted for confounders to assess preterm birth risk across paternal age groups.
- Nonparametric regression used to model the effect of paternal age on very preterm births.
Main Results:
- Paternal age was significantly associated with an increased risk of preterm birth.
- The risk for very preterm births escalated more rapidly with paternal age compared to moderate preterm births.
- Fathers aged 45-49 showed significantly higher odds of very preterm births with younger mothers.
Conclusions:
- Paternal age is a confirmed contributor to preterm birth risk.
- The association between paternal age and preterm birth is stronger for very preterm outcomes.
- Advanced paternal age also influences the risk of moderate preterm births, highlighting its broad impact.
Background:
Advanced paternal age has been reported to impair pregnancy outcome. Here, we investigated the association of advanced paternal age with preterm birth by using a very large national data set.
Methods:
We analyzed data from 1990 to 1998 on Italian firstborn singletons to mothers 20-24 and 25-29 years of age (n = 1,510,823). Odds ratios for overall preterm (<37 weeks' gestation), very preterm (<32 weeks), and moderate preterm (32-36 weeks) births were evaluated through logistic regression models in paternal age classes (20-24, 25-29, 30-34, 35-39, 40-44, 45-49, 50+ years) after adjustment for confounders. Nonparametric regression models were used to fit the effect of paternal ageing on the incidence of very preterm births.
Results:
Odds ratios increased with paternal age more rapidly for very preterm than for moderate preterm births; among 45- to 49-year-old fathers, odds ratios for very preterm births reached 1.91 (95% confidence interval = 1.08-3.38) and 1.72 (1.25-2.36), respectively, in 20- to 24- and 25- to 29-year-old mothers.
Conclusions:
This study confirms that paternal age contributes to the risk of preterm birth. The effect is stronger on very preterm births but also influences moderate preterm births.
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