Keyphrases
Age at First Birth
100%
Preterm Birth Risk
100%
Subsequent Pregnancy
100%
Second Pregnancy
60%
Preterm Birth
40%
Hazard Ratio
40%
Sweden
40%
Denmark
40%
Cox Proportional Hazards Regression Analysis
20%
Infant Age
20%
Preterm Delivery
20%
Medical Birth Registry
20%
Singleton
20%
With Woman
20%
Health Relevance
20%
Maternal Characteristics
20%
Interpregnancy Interval
20%
Maternal Age
20%
Confidence Interval
20%
Gestational Age
20%
Male Fetus
20%
Second Birth
20%
Public Health
20%
Medicine and Dentistry
Premature Labor
100%
Hazard Ratio
33%
Gestational Age
16%
Proportional Hazards Model
16%
Maternal Age
16%
Public Health
16%
Biochemistry, Genetics and Molecular Biology
Pharmacology, Toxicology and Pharmaceutical Science