Current explanations on the link between mortality and fertility imply that mortality exposure increases fertility desires. Conversely, Emily Smith-Greenaway, Sara Yeatman, and Abdallah Chilungo find that, in Malawi, increased mortality in women’s social networks corresponds with a subsequent short-term increase in the risk of unintended pregnancy, but not of intended pregnancy. 

A key proposition of demographic transition theory is that a population’s fertility rate will decline after its mortality rate declines. This relationship is not monotonic however, and over the last several decades, demographers have demonstrated that mortality in one’s family and community can lead to an increase in women’s fertility. What remains speculative, however, is why this is the case. Does exposure to mortality increase women’s fertility by driving their desire to become pregnant? Or does mortality exposure increase women’s fertility primarily through nonvolitional mechanisms? 

The demographic literature tends to assume the former: that the mortality–fertility link is borne out of volitional mechanisms. For instance, many studies point to the existence of ‘replacement’ and ‘insurance’ effects whereby women may desire another birth to fill the void a death has left or to quiet the suspicion that such a void will define their future. Yet, other social science literatures outline how exposure to death might also affect women’s fertility through non-volitional pathways. 

Psychological research emphasizes the abstract ways that mortality affects people: reminders of death encourage people to engage in ‘future discounting’ and to behave in riskier ways. Moreover, psychological theory describes how people use intimacy to offset the existential threat of death. From a perspective of mourning and loss, experiencing the death of a loved one can also exact an emotional toll on women, and poor mental health is a well-studied risk factor for unintended fertility. 

At the same time, death is disruptive. Even when a death is expected, its precise timing is unknown, upending people’s lives—at least temporarily. The need to travel to a funeral or help host one on short notice could distract women away from to day-to-day matters, such as their contraceptive routine. 

Fluctuations in network mortality and unintended pregnancy in a high-mortality community 

Acknowledging the diverse ways that death and loss can affect people, in a recent study (Smith-Greenaway et al 2022) we sought to expand demography’s repertoire of explanations for how mortality influences fertility by studying if experiences of social network mortality affect women’s risk of unintended or intended pregnancy. We made use of longitudinal data from Tsogolo la Thanzi, a study of 15-25-year-old women in Malawi who live in a community composed of approximately 200 small villages surrounding a bustling town center (Yeatman et al 2019). 

Critical to our study, women were interviewed every four months, during which they reported their desired timing of next birth and took a urine pregnancy test. This allowed us to link their prospective fertility desires to conceptions that occurred within four months. We classified a pregnancy as intended or unintended depending on whether, at the prior wave, the woman had reported wanting or not wanting her first/next birth within two years. We also accounted for women who, as intended, did not become pregnant over the study period (i.e., women who avoided pregnancy successfully).

To approximate women’s recent exposure to mortality in their social network, interviewers asked women how many funerals they had attended in the month before the interview. Funeral attendance is measured at the wave before a pregnancy was observed. 85% of women attended at least one funeral over the brief study period, with attendance ranging from 0 to 11 at each wave. The frequency of deaths in women’s social networks, combined with the high number of pregnancies observed among the sample, allowed us to examine if short-term fluctuations in women’s exposure to mortality in their social network altered their immediate hazard of unintended (or intended) pregnancy.  

Figure 1 shows results based on a competing risk model that examined women’s hazard of unintended pregnancy versus no pregnancy while accounting for the competing risk of intended pregnancy. It depicts the cumulative incidence of having an unintended pregnancy by intensity of recent funeral attendance net of the control variables noted. For women who had not attended any funerals recently, the cumulative incidence of unintended pregnancy was 20% relative to 40%–50% for women who had attended more than four. 

In an additional model, we examined if recent funeral attendance corresponded with women’s likelihood of intended pregnancy versus no pregnancy while accounting for the competing risk of unintended pregnancy. We found no evidence that mortality in the social network is independently associated with women’s likelihood of having an intended pregnancy. This likelihood is patterned by demographic factors, including age, parity, and marital status. 

Implications 

That exposure to mortality in their social network can increase women’s risk of unintended pregnancy demonstrates that the mortality-fertility nexus is not predicated on women’s desires, as previously assumed, but can stem from women’s inability to realize their desires. By measuring deaths that happen in the mundanity of everyday life, our research emphasizes how adversely consequential death can be—helping to clarify that, at least in some instances, the mortality-fertility link is evidence of a pernicious cycle of social disadvantage. Future studies of the relationship between mortality and fertility, such as those that seek to characterize the impact of COVID-19, should attend to this new perspective, and must privilege women’s fertility desires. Doing so is essential to characterize accurately the nature and consequence of any observed relationship. 

References

Yeatman S., Chilungo A., Lungu S., Namadingo H., Trinitapoli J. 2019. Tsogolo la Thanzi: A Longitudinal Study of Young Adults Living in Malawi’s HIV Epidemic, Studies in Family Planning, 50(1): 71-84.

Smith-Greenaway E., Yeatman S., Chilungo A. 2022. Life After Loss: A Prospective Analysis of Mortality Exposure and Unintended Fertility, Demography, online first https://doi.org/10.1215/00703370-9807961

Note figure 1 – See https://doi.org/10.1215/00703370-9807961 for more
information.