Evidence map›Paper›PMID 27521438›Full record

ArticleNeurology2016

Incidence of subarachnoid hemorrhage is decreasing together with decreasing smoking rates.

Miikka Korja, Hanna Lehto, Seppo Juvela, Jaakko Kaprio

Abstract read
In one paragraph

Article in Neurology, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 97 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
97citing papers in PubMed, 3 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

97 citing papers in PubMed, 3 syntheses or guidelines pooled it.

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  7. Haemorrhage, hypercoagulability and ischaemia: Evolution of brain injury after aneurysmal subarachnoid haemorrhage.Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism · 2026
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  19. Cancer-type somatic mutations in saccular cerebral aneurysms.European journal of human genetics : EJHG · 2025
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37 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

4 authors.

Miikka KorjaFrom the Department of Neurosurgery (M.K., H.L.), University of Helsinki and Helsinki University Hospital; Departments of Clinical Neurosciences (S.J.) and Public Health (J.K.), University of Helsinki; Department of Health (J.K.), National Institute for Health and Welfare; and Institute for Molecular Medicine FIMM (J.K.), Helsinki, Finland. miikka.korja@hus.fi.
Hanna LehtoFrom the Department of Neurosurgery (M.K., H.L.), University of Helsinki and Helsinki University Hospital; Departments of Clinical Neurosciences (S.J.) and Public Health (J.K.), University of Helsinki; Department of Health (J.K.), National Institute for Health and Welfare; and Institute for Molecular Medicine FIMM (J.K.), Helsinki, Finland.
Seppo JuvelaFrom the Department of Neurosurgery (M.K., H.L.), University of Helsinki and Helsinki University Hospital; Departments of Clinical Neurosciences (S.J.) and Public Health (J.K.), University of Helsinki; Department of Health (J.K.), National Institute for Health and Welfare; and Institute for Molecular Medicine FIMM (J.K.), Helsinki, Finland.
Jaakko KaprioFrom the Department of Neurosurgery (M.K., H.L.), University of Helsinki and Helsinki University Hospital; Departments of Clinical Neurosciences (S.J.) and Public Health (J.K.), University of Helsinki; Department of Health (J.K.), National Institute for Health and Welfare; and Institute for Molecular Medicine FIMM (J.K.), Helsinki, Finland.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveTo determine the nationwide incidence of subarachnoid hemorrhage (SAH) and report nationwide changes in smoking rates between 1998 and 2012 in Finland.

methodsIn this register-based study, we utilized the nationwide Causes of Death Register and Hospital Discharge Register in identifying SAH events between 1998 and 2012. Population statistics in Finland, which were obtained through a database of Statistics Finland, were used to calculate crude annual incidence rates of SAH. For the direct age standardization of crude incidence rates, we used the European Standard Population (ESP) 2013. Data on changes in nationwide smoking rates between 1998 and 2012 were extracted from a database of the National Institute for Health and Welfare.

resultsFor the total of 79,083,579 cumulative person-years, we identified 6,885 people with SAH. Sudden deaths from SAH away from hospitals or in emergency rooms accounted for 1,771 (26%) of the events. Crude nationwide annual incidence rates varied between 6.2 and 10.0 per 100,000 persons, and increased by age particularly in women. Among 70- to 75-year-old women, the incidence of SAH was highest (22.5 per 100,000 persons). The 3-year average of ESP standardized incidence decreased 24% from 11.7 in 1998-2000 to 8.9 per 100,000 persons in 2010-2012. Daily smoking decreased 30% between 1998 and 2012.

conclusionsThe incidence of SAH seems to be decreasing. This tendency may be coupled with changes in smoking rates. The incidence of SAH in Finland is similar to other Nordic countries.

Indexed as

AdolescentAdultFemaleFinlandHumansIncidenceMaleMiddle AgedRegistriesSmokingSubarachnoid HemorrhageYoung Adult

Identifiers

PMID27521438
PMCPMC5027805

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.