Research article
Nocturnal heat exposure and stroke risk
- Case-crossover study
- time-stratified
- distributed lag non-linear model
Authors' conclusion
This study found nocturnal heat exposure to be related to elevated stroke risk after controlling for maximum daytime temperature, with increasing susceptibility between 2006 and 2020.
Study context
- Population
- Clinical stroke cases during warmer months (May to October), Augsburg, Germany, 2006–2020
- Participants
- 11,037 stroke cases
- Comparison
- Extreme nighttime heat vs other days
- Outcome
- Stroke risk associated with extreme nighttime heat (hot night excess index)
Main finding
As reported in the abstract
Stroke risk on days with extreme nighttime heat (97.5% percentile of HNE) · full study period
OR, extreme nighttime heat
1.07 (95% CI 1.01-1.15)
Further findings
Hot night excess (HNE)-related risk, 2013-20 vs 2006-12 (all strokes and ischaemic strokes)
- Significant increase in HNE-related risk for all strokes and ischaemic strokes in the more recent period
- P < 0.05
Susceptibility by age, sex, stroke severity (subgroups)
- Older individuals, females and patients with mild stroke symptoms showed significantly increased vulnerability to nighttime heat
Original publication
Nocturnal heat exposure and stroke risk. Eur Heart J. Published 21 May 2024. doi:10.1093/eurheartj/ehae277
Summarised from the published abstract; every number is checked against it