TY - GEN AU - Swanson,D A TI - Age at first birth and the length of the second birth interval: is a positive relationship universal in modern populations? PY - 1987///1104 KW - Age Factors KW - Americas KW - Behavior KW - Birth Intervals KW - Birth Rate KW - Contraception KW - Contraception Behavior KW - Culture KW - Demography KW - Developed Countries KW - Developing Countries KW - Economics KW - Ethnicity KW - Family Planning Services KW - Fertility KW - Gender Identity KW - Hawaii KW - Health Services Accessibility KW - Maternal Age KW - North America KW - Parents KW - Population KW - Population Characteristics KW - Population Dynamics KW - Research KW - Social Behavior KW - Socioeconomic Factors KW - United States KW - White People KW - Women's Rights N1 - Publication Type: Journal Article ER -