Socio-economic differences in self-reported insomnia and stress in Finland from 1979 to 2002: a population-based repeated cross-sectional survey.

BMC Public Health · 2012 · PMC3509034 · PMID 22889044

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a decreasing trendno p-value reported

The trend in the prevalence of insomnia was slightly u-shaped; a decreasing trend was seen after the study period 1979–1982, but then the prevalence began to increase again in the latest study periods (Figure 1 ).

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