Katri Sääksjärvi

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BACKGROUND Poor sleep tends to be patterned by sociodemographic and socioeconomic factors. The aim of this study was to examine the associations of sociodemographic and socioeconomic factors with sleep duration and insomnia-related symptoms across life course. METHODS We used cross-sectional Health 2000 Survey (2000-2001) among a total of 5,578 adult(More)
OBJECTIVE To investigate whether serum vitamin D level predicts the risk of Parkinson disease. DESIGN Cohort study. SETTING The study was based on the Mini-Finland Health Survey, which was conducted from 1978 to 1980, with Parkinson disease occurrence follow-up through the end of 2007. During the 29-year follow-up period, 50 incident Parkinson disease(More)
BACKGROUND The objective of this study was to assess the agreement and repeatability of 2 methods of measuring habitual coffee consumption, and to examine their homogeneity with respect to socioeconomic and lifestyle factors. METHODS Data on coffee consumption were collected from 4254 subjects by means of a health questionnaire (HQ) and a 1-year dietary(More)
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