Many earlier studies rely on correlations

The gap

Evidence profile

Sourced from the future-work section and stated research gap and conclusions of the source papers, classified as general, drawn from work published between 1971 and 2026, spanning 3 journals.

Supporting evidence — 4 representative gaps

• Partners’ age differences and first birth transitions by age at first and second union in Europe (2026) · Vienna Yearbook of Population Research · doi

  Future research should investigate the link between age differences and fertility in different cultural and socioeconomic contexts. The study's findings suggest the need for further research on the role of partners' age differences in fertility decisions. Future research should examine the implications of the study's findings for policymakers and practitioners working in the field of family planning and fertility.

  generalfuture-work section
  Keywords: future research investigate link between age differences fertility
• Socioeconomic correlates of fertility in the metropolis: Relationship of individual and areal unit characteristics (1971) · Social Biology · doi

  Many earlier studies rely on correlations between fertility rates and socioeconomic characteristics of areas to infer the relationship between socioeconomic characteristics and fertility rates of individual couples. There is a need for a more refined study of the relationships between fertility, age of wife, status indicators, and residence.

  generalstated research gap
  Keywords: many earlier studies rely correlations between fertility rates
• A re‐examination of the heritability of fertility in the British peerage (1974) · Social Biology · doi

  Further research is needed to confirm the study's findings and to examine the heritability of fertility in other populations. The study's results may be relevant for the development of future research on the genetic component of fertility. The identification of a secular change in fertility may suggest new avenues for research on demographic trends.

  generalfuture-work section
  Keywords: further research needed confirm study findings examine heritability
• Can fertility be estimated from current pregnancy data? (1980) · Population Studies · doi

  Although our results do not encourage the use of current pregnancy reports for the estima- tion of fertility levels or age patterns, their potential for the analysis of fertility differentials or trends in fertility has not been investigated. Even when relying on the 5-7 month formula, there is simply too much underreporting of pregnancies, which unfortunately varies widely in magnitude in different countries.

  generalconclusionsevidence 5/5
  Keywords: fertility encourage current pregnancy reports estima tion levels patterns potential differentials trends investigated even relying

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