Change and stability: Within-person life satisfaction over a 20-year period using data from the HUNT survey.

Background: The aim of the present study was to investigate within-person life satisfaction (LS) dynamics for two age groups, 20-29 and 30-39 years, from 1984 to 1986 and to follow them over a 20-year period. Methods: Data from 1984 to 2008 were extracted from the large, prospective, longitudinal North-Trøndelag Health Study (HUNT), Norway. This paper includes data from more than 14,500 persons. Data were analysed using logistic regression, and LS dynamics were modelled using gender, time and self-rated health. Results: The analyses revealed that about 20% of people in these age groups had a stable level in LS, also known as set point. Long-term LS change, defined as ⩾2 SDs, was reported for 9% and 6% of people in the youngest and oldest age groups, respectively. A large proportion of more than 70% of people had fluctuations in their LS over a 20-year period. A significant decrease in within-person LS was seen for the age groups from 1984-86 to 1995-97 where a significant increase appeared from 1995-97 to 2006-08. For the initial 20-29 age group, the odds of having a higher score increased by 34%, and for the initial 30-39 age group, the within-person LS increase was 81%. Self-rated health was the most crucial variable influencing within-person LS. Conclusions: These findings suggest that a significant proportion of the responders had a long-term within-person LS change over the 20-year period.

Age groups changes in self-rated health: A prospective longitudinal study over a 20-year period using Health Survey of North Trøndelag data.

Background: The aim of the study was to investigate changes in self-rated health (SRH) between different age groups and sexes over a 20-year period. Methods: Data were retrieved from the large longitudinal Health Survey of North Trøndelag, Norway, which includes data collected from more than 190,000 participants aged 20-70+ years between the years 1984 and 2008. Data were analysed using logistic regression and adjusted for sex. Results: From 1984 to 2008, the odds of scoring higher on SRH decreased by 46% in the youngest age group (20-29 years) and increased by approximately 35% in the middle-aged and older age groups (40-70+ years). When considering sex differences, women in most age groups scored lower than the men on their SRH. Conclusions: Our finding suggest a trending shift in SRH, with a reduction in the youngest age group (20-29 years) and an increase in the middle-aged and older age groups (40-70+ years). Despite the sex differences being small, our data indicate that in most age groups, women tend to score lower than men on their SRH. Future studies should focus on these trends to understand better the mechanisms underlying these changes in SRH and to follow future trends to see if the trend is reinforced or diminished.