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Rising heat and humidity increase pregnancy termination risks in Nigeria (opens in a new tab)

news-medical.net · 2026-10-26

Short answerEvidenceSource

Short answer

Mixed

Mixed.

One claim goes further than the study. 2 other points were not covered by the paper.

  • 2 supported
  • 1 overstated
  • 2 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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Follow the evidence trail
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NewsLink checks it

Mixed

One claim overstates the study. Two of five check out. Two claims the study doesn't address.

  • 2 supported
  • 1 overstated
  • 2 not covered
Open claim evidence
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Then inspect each claim

Evidence layer

Claim by claim

Each claim gets a verdict. Expand it to see the evidence directly below.

5 claims in this story

Showing all 5 claimsChoose a verdict to focus the list.

Claim 1 of 5OverstatedNew research led by the University of Michigan suggests that increasing heat and humidity raise pregnancy termination risks in Nigeria.View evidenceHide evidence

Why this verdict

The abstract-level profile supports an observational association between hot-humid exposure during pregnancy and increased pregnancy-termination probability in Nigeria. However, the headline-style wording that heat and humidity “raise” risks is stronger and more causal-sounding than the observational evidence warrants, especially given the paper profile’s explicit caveats about confounding and combined termination types. The headline also outruns the more associational framing used elsewhere in the story.

1

Study evidence

Higher hot-humid exposure during pregnancy is associated with an increased probability of pregnancy termination (spontaneous and induced).1.73 terminations per 100 pregnancies (95% CI: 0.7 to 2.7)

“linear probability models to examine the relationship between humid-heat exposure and pregnancy termination (spontaneous and induced)”
Claim 2 of 5Not coveredThe study used two waves of Nigeria Demographic and Health Surveys spanning 2003 to 2016 and combined station and satellite data to estimate daily maximum wet-bulb globe temperature across Nigeria from 1983 to 2016.View evidenceHide evidence

Why this verdict

The abstract-level profile supports that DHS reproductive histories were spatially integrated with a high-resolution blended remotely sensed and station-derived WBGT dataset spanning 1983–2016. But the profile at abstract depth does not verify the specific claim of “two waves” of DHS spanning 2003–2016 or the full detail that daily maximum WBGT was estimated across Nigeria from 1983 to 2016.

1

Study evidence

Higher current-month humid-heat (maximum WBGT) is associated with fewer conceptions.0.2 fewer conceptions per 1,000 woman-months (95% CI: 0.03 to 0.4)

“we spatially integrate Demographic and Health surveys with a high-resolution, blended remotely sensed and station-derived dataset of humid-heat events spanning 1983–2016”
2

Study evidence

Higher hot-humid exposure during pregnancy is associated with an increased probability of pregnancy termination (spontaneous and induced).1.73 terminations per 100 pregnancies (95% CI: 0.7 to 2.7)

“linear probability models to examine the relationship between humid-heat exposure and pregnancy termination (spontaneous and induced)”
Claim 3 of 5Not coveredDuring a month of exposure to high wet-bulb globe temperatures, conceptions fell by about 1.4% compared with the average of just above 15 conceptions per 1,000 woman-months, then rose by 2.3% the following month and by 5% after two months.View evidenceHide evidence

As statedabout 1.4% decline, then 2.3% and 5% increases

Why this verdict

The abstract-level profile supports the direction of the conception findings: higher current maximum WBGT is associated with fewer conceptions, while hotter exposure 1–2 months earlier is associated with increased conception probability. It gives a current-month estimate of 0.2 fewer conceptions per 1,000 woman-months, but it does not provide the story’s stated baseline of just above 15 conceptions per 1,000 woman-months or the lagged percentage increases of 2.3% and 5%. Those precise percentage claims are therefore not verifiable from the supplied abstract-level profile.

1

Study evidence

Higher current-month humid-heat (maximum WBGT) is associated with fewer conceptions.0.2 fewer conceptions per 1,000 woman-months (95% CI: 0.03 to 0.4)

“we spatially integrate Demographic and Health surveys with a high-resolution, blended remotely sensed and station-derived dataset of humid-heat events spanning 1983–2016”
Claim 4 of 5SupportedIncreasing humid heat was strongly associated with an increased likelihood of early pregnancy terminations, although the surveys did not ask whether those terminations were induced or spontaneous.View evidenceHide evidence

Why this verdict

The paper profile reports that hot-humid exposure during pregnancy was associated with increased pregnancy-termination probability, estimated at 1.73 additional terminations per 100 pregnancies with a 95% CI of 0.7 to 2.7. It also states that the termination outcome combines spontaneous and induced terminations, aligning with the story’s caveat that the surveys do not distinguish those categories. The exact phrase “early pregnancy terminations” is not separately detailed at abstract depth, but the main associational claim is supported.

1

Study evidence

Higher hot-humid exposure during pregnancy is associated with an increased probability of pregnancy termination (spontaneous and induced).1.73 terminations per 100 pregnancies (95% CI: 0.7 to 2.7)

“linear probability models to examine the relationship between humid-heat exposure and pregnancy termination (spontaneous and induced)”
Claim 5 of 5SupportedThe article says the net result was an overall increase in conception probability, with shifts in pregnancy timing that were more pronounced among women with less education, women in rural areas, and in northern Nigeria.View evidenceHide evidence

Why this verdict

The abstract-level profile reports that current humid heat decreases conceptions while exposure 1–2 months prior increases conception probability, and it notes a net increase in births overall with shifts in timing. It also reports larger conception-related effects for women in rural areas, northern districts, and women with lower educational attainment. The story’s subgroup claim is therefore supported, although the abstract profile also mentions Muslim women as a subgroup and does not provide subgroup-specific numerical estimates.

1

Study evidence

Higher current-month humid-heat (maximum WBGT) is associated with fewer conceptions.0.2 fewer conceptions per 1,000 woman-months (95% CI: 0.03 to 0.4)

“we spatially integrate Demographic and Health surveys with a high-resolution, blended remotely sensed and station-derived dataset of humid-heat events spanning 1983–2016”
2

Study evidence

Effects of humid-heat on conception were larger for women residing in rural areas, in northern districts, for Muslim women, and for women with lower educational attainment.

“Subgroup analyses reveal that effects of humid-heat on conception were larger for women residing in rural areas or in northern districts, or who are Muslim or have lower educational attainment”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • The study is observational secondary-data research linking DHS reproductive histories to gridded WBGT data; associations may be affected by unmeasured confounding and should not be interpreted as definitive causal effects.

    The story often uses associational wording in the body, but the listed caveats do not mention the observational design or unmeasured-confounding limitation, and the headline-style claim uses stronger causal-sounding language.

    From secondary_data; discrete-time event-history modeling; observational secondary data linkage; Subgroup/heterogeneity analy

  • The paper also reports heterogeneity in pregnancy-termination associations: larger associations in southern areas, among older women, and among Christian women.

    The supplied story claims discuss subgroup differences for conception timing but do not mention the distinct subgroup pattern for pregnancy-termination associations.

    From observational secondary data linkage; Subgroup/heterogeneity analyses (stratified comparisons within observational regre

4 things the story did carry across
  • The paper’s central conception finding is that higher current-month maximum WBGT is associated with fewer conceptions, while hotter exposure 1–2 months earlier is associated with increased conception probability, implying timing shifts and a net increase in births overall.
  • The paper’s central pregnancy-termination finding is that hot-humid exposure during pregnancy is associated with increased probability of pregnancy termination, with the abstract-level estimate of 1.73 additional terminations per 100 pregnancies.
  • The pregnancy-termination outcome combines spontaneous and induced terminations, which can involve different mechanisms and creates outcome heterogeneity or misclassification concerns.
  • The paper reports heterogeneity in conception effects: larger effects for women in rural areas, northern districts, Muslim women, and women with lower educational attainment.
Then read the study layer

Study layer

Study at a glance

Scan the study first. Expand only the parts you want to inspect.

Pieces of work

3

Evidence read

study summary

Lead result

secondary data

1Lead resultsecondary dataEstimate the effect of humid-heat exposure on conception probability (including timing shifts from exposures 1–2 months prior) among women in Nigeria by linking DHS reproductive histories to high-resolution humid-heat data.secondary data; discrete-time event-history modelingExpand

In plain English

Using linked DHS reproductive histories and a high-resolution blended wet-bulb globe temperature (WBGT) dataset (1983–2016) for Nigeria, the authors used discrete-time (woman-month) models to estimate how current and 1–2 month lagged humid-heat exposure relate to conception probability. They report that higher current maximum WBGT is associated with fewer conceptions, while hotter exposures 1–2 months earlier are associated with increased conception probability.

Key findings

  • Higher current-month humid-heat (maximum WBGT) is associated with fewer conceptions.0.2 fewer conceptions per 1,000 woman-months (95% CI: 0.03 to 0.4)
  • Hotter humid-heat exposure 1–2 months prior is associated with increased conception probability.
“we spatially integrate Demographic and Health surveys with a high-resolution, blended remotely sensed and station-derived dataset of humid-heat events spanning 1983–2016”
2secondary dataEstimate the effect of hot-humid exposure during pregnancy on risk of pregnancy termination (spontaneous and induced) among pregnancies in Nigeria using linked DHS and humid-heat data.observational secondary data linkageExpand

In plain English

Using linked Demographic and Health Survey reproductive histories and a high-resolution wet-bulb globe temperature (WBGT) dataset (1983–2016) for Nigeria, the authors report that higher hot-humid exposure during pregnancy is associated with an increased probability of pregnancy termination (combined spontaneous and induced). In linear probability models, the estimated increase in terminations is 1.73 per 100 pregnancies (95% CI: 0.7 to 2.7). Subgroup analyses indicate larger associations in southern areas, among older women, and among Christian women.

Key findings

  • Higher hot-humid exposure during pregnancy is associated with an increased probability of pregnancy termination (spontaneous and induced).1.73 terminations per 100 pregnancies (95% CI: 0.7 to 2.7)
  • Associations between in-pregnancy humid-heat exposure and termination risk were larger in certain subgroups.
“linear probability models to examine the relationship between humid-heat exposure and pregnancy termination (spontaneous and induced)”
What this piece can’t prove
  • Observational design; potential for unmeasured confounding that could bias associations.
  • Exposure misclassification risk because WBGT is assigned from gridded data to individual pregnancies and abstract lacks details on spatial/temporal matching.
  • Pregnancy termination is self-reported in DHS and combines spontaneous and induced terminations, risking outcome misclassification and heterogeneity.
  • Abstract does not report sample sizes, covariate set, model specification details (e.g., controls, fixed effects), or sensitivity analyses, limiting assessment of robustness.
3secondary dataAssess heterogeneity/inequality in humid-heat–fertility associations across subgroups (e.g., rural vs urban, region/north-south, religion, education, age).Subgroup/heterogeneity analyses (stratified comparisons within observational regression framework)Expand

In plain English

The paper reports subgroup (heterogeneity) analyses showing that humid-heat effects on fertility outcomes in Nigeria differ across sociodemographic and geographic groups: humid-heat–related reductions in conception were larger for women in rural areas, northern districts, Muslim women, and women with lower educational attainment, while humid-heat–related increases in pregnancy termination were larger for women in southern areas, older women, and Christian women. The authors note that these differential associations could exacerbate existing inequalities.

Key findings

  • Effects of humid-heat on conception were larger for women residing in rural areas, in northern districts, for Muslim women, and for women with lower educational attainment.
  • Association between humid-heat exposure during pregnancy and pregnancy termination was larger for women in southern areas, for older women, and for Christian women.
“Subgroup analyses reveal that effects of humid-heat on conception were larger for women residing in rural areas or in northern districts, or who are Muslim or have lower educational attainment”
What this piece can’t prove
  • The abstract does not detail covariate adjustment, formal interaction tests, or sample sizes within each subgroup.

2 further details could not be confirmed from the summary.

Finally, the search trail

Method layer

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Open the paper in Tessa

Humid-heat shifts conceptions and increases pregnancy termination risks in Nigeria

Proceedings of the National Academy of Sciences · 2026

Source record (opens in a new tab)

Why this one

Near certain

NewsLink found the paper. Tessa is where you inspect it deeply.

Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed · 16 candidate papers

Selected

Humid-heat shifts conceptions and increases pregnancy termination risks in Nigeria

Proceedings of the National Academy of Sciences · 2026 · Crossref

Source (opens in a new tab)
Candidate

A Climatology of Wet-Bulb Globe Temperature for the Southeastern United States with Implications for Human Health

Crossref

Source (opens in a new tab)

And 10 more candidates considered.