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Increasing income-based inequality in suicide mortality among working-age women and men, Sweden, 1990–2007: is there a point of trend change?
  1. Ayako Hiyoshi1,2,
  2. Naoki Kondo3,
  3. Mikael Rostila2,4
  1. 1 Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden
  2. 2 Department of Public Health Sciences, Stockholm University, Stockholm, Sweden
  3. 3 School of Public Health, The University of Tokyo, Bunkyo-ku, Japan
  4. 4 Centre for Health Equity Studies, Stockholm University/Karolinska Institutet, Stockholm, Sweden
  1. Correspondence to Dr Naoki Kondo, School of Public Health, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan; naoki-kondo{at}umin.ac.jp

Abstract

Background Income inequalities have risen from the 1990s to 2000s, following the economic recession in 1994, but little research has investigated socioeconomic inequalities in suicide mortality for working-age men and women (aged between 30 and 64 years) over the time using longitudinal data in Sweden.

Methods Using Swedish national register data between 1990 and 2007 as a series of repeated cohort studies with a 3-year follow-up (sample sizes were approximately 3.7 to 4.0 million in each year), relative and slope indices of inequality (RII and SII respectively) based on quintiles of individual disposable income were calculated and tested for temporal trends.

Results SII for the risk of suicide mortality ranged from 27.6 (95% CI 19.5 to 35.8) to 44.5 (36.3 to 52.6) in men and 5.2 (0.2 to 10.4) to 16.6 (10.7 to 22.4) in women (per 100 000 population). In men, temporal trends in suicide inequalities were stable in SII but increasing in RII by 3% each year (p=0.002). In women, inequalities tended to increase in both RII and SII, especially after the late-1990s, with 10% increment in RII per year (p<0.001).

Conclusions Despite universal social security and generous welfare provision, income inequalities in suicide were considerable and have widened, especially in women. The steeper rise in women may be partially related to higher job insecurity and poorer working conditions in the female dominated public sector after the recession. To reduce health consequences following an economic crisis and widened income inequalities, additional measures may be necessary in proportion to the levels of financial vulnerability.

  • suicide
  • socio-economic
  • health inequalities
  • cohort studies

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Footnotes

  • AH and NK contributed equally and are joint first authors.

  • Contributors AH: created the first draft of the manuscript. NK: was responsible for study conception, design and analysis and critically reviewed the manuscript. MR: supported NK and AH in study conception and critically reviewed the manuscript.

  • Funding This work was supported by the Ministry of Education, Culture, Sports, Science and Technology, MEXT, Japan (grant number Nos. 21119002, 25253052, 18H04071 to NK); the Ministry of Health, Labour and Welfare, Japan (grant number H24-chikyukibo-ippan-009 to NK); and Swedish Research Council for Health, Working Life and Welfare (2016-07128 to MR).

  • Competing interests None declared.

  • Ethics approval Ethical permission (No. 02 – 481) was provided by the Regional Ethics Committee at Karolinska Institutet in Stockholm.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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