BACKGROUND Numerous studies have reported declines in semen quality and other
markers of male reproductive health. Our previous meta-analysis reported a significant …

BACKGROUND Reported declines in sperm counts remain controversial today and recent
trends are unknown. A definitive meta-analysis is critical given the predictive value of sperm …

STUDY QUESTION What is the contemporary prevalence of infertility in world populations
and how do they differ by methodological and study characteristics? SUMMARY ANSWER …

Background During the past 25 years, many pregnancy and birth cohorts have been
established. Each cohort provides unique opportunities for examining associations of early …

Objectives: Exposure to high concentrations of persistent organochlorines may cause fetal
toxicity, but the evidence at low exposure levels is limited. Large studies with substantial …

Background Some legacy and emerging environmental contaminants are suspected risk
factors for intrauterine growth restriction. However, the evidence is equivocal, in part due to …

OBJECTIVE: To evaluate whether overweight and obesity are related to changes in serum
sex hormone concentrations and semen quality. DESIGN: Cross-sectional study. SETTING …

Introduction: To date, the evidence for an association between perfluoroalkyl substances
(PFAS) exposure and attention deficit and hyperactivity disorder (ADHD) is inconclusive …

BACKGROUND: Previous studies suggest a deleterious effect of cigarette smoking on
semen quality, but their results have not been consistent. We studied the association …

Abstract Recently, many studies have found a decrease in semen quality which has
increased the focus on male reproductive health. Occupational hazards are by far the best …