Keyphrases
China
100%
Increasing Trends
100%
Preterm Birth
100%
Trends in Incidence
100%
Age-period-cohort Analysis
100%
Multiparous Mothers
40%
Maternal Age
30%
Primiparous Mothers
30%
Confidence Interval
20%
Birth Cohort
20%
Risk Ratio
20%
Preterm Birth Risk
20%
Cohort Effect
20%
High Risk
10%
Low Risk
10%
Gestational Week
10%
Public Health Policy
10%
Long-term Trends
10%
Temporal Change
10%
V-shaped
10%
Surveillance System
10%
Health Care Delivery
10%
Public Education
10%
Period Effect
10%
Aging Period
10%
Population-based Study
10%
Primiparous and multiparous
10%
U-shaped Association
10%
Maternal Parity
10%
Maternal Age Effect
10%
Premature Birth
10%
Perinatal Healthcare
10%
Birth Incidence
10%
Singleton Live Birth
10%
J-shaped
10%
Age-period-cohort Model
10%
Medicine and Dentistry
Cohort Analysis
100%
Premature Labor
100%
Neonatal Infant
100%
Maternal Age
36%
Cohort Effect
9%
Pregnancy
9%
Prematurity
9%
Health Care
9%
Public Health Policy
9%
Surveillance System
9%
U-Shaped Association
9%
Perinatal Health
9%
Nursing and Health Professions
Cohort Analysis
100%
Premature Labor
100%
Maternal Age
36%
Confidence Interval
18%
Prematurity
9%
Health Care
9%
Nutrition Policy
9%
Health Policy
9%
Epidemiology
9%
Live Birth
9%
Pharmacology, Toxicology and Pharmaceutical Science
Premature Labor
100%
Public Health Policy
9%
Prematurity
9%
Epidemiology
9%
Biochemistry, Genetics and Molecular Biology
Maternal Age
100%
Pregnancy
25%