[Association between use of the "health-supportive" roadside station and self-rated health: A three-wave longitudinal study].

Objective　Mutsuzawa town, Chiba Prefecture, relocated a "health-supportive" roadside station in 2019. The underlying hypothesis is that older people who use the roadside station will have better self-rated health than those who do not use it. We aimed to verify whether roadside station use was associated with a decrease in poor self-rated health.Method　This was a longitudinal study that compared and evaluated the roadside station use and non-use groups using three-wave panel data before and after relocation of the roadside station in September 2019. To obtain three-wave panel data, self-administered questionnaires were mailed three times: in July 2018 (FY 2018) before the station was relocated and in November 2020 (FY 2020) and January 2022 (FY 2021) after the relocation in 2019. The dependent variable was poor self-rated health in FY 2021, and the independent variable was use of the roadside station as of FY 2020. Covariates included basic characteristics from FY 2018, as well as going out, social participation, and interacting on social networks in FY 2018 and FY 2020. A multivariate analysis was conducted using multiple imputation to complete missing values for the Crude model, which included the basic attributes of FY 2018 (Model 1); going out, social participation, and interacting on social networks in FY 2018 (Model 2); and going out, social participation, and interacting on social networks in FY 2020 (Model 3). The cumulative incidence rate ratio (CIRR), 95% confidence intervals, and P-values were calculated using a modified Poisson regression analysis for each model.Results　Of the 576 participants, 344 (59.8%) were roadside station users. The multivariate analysis adjusted for basic attributes revealed that the number of people with poor self-rated health in the user group was significantly lower than that in the non-user group, with a CIRR of 0.67 (95% confidence interval: 0.45-0.99, P=0.043). However, the adjusted model showed a CIRR of 0.71 (95% confidence interval: 0.48-1.06, P=0.096) for going out, social participation, and interacting on social networks in FY2020 after the roadside station opened.Conclusion　Findings of this study revealed that, after adjusting for confounding factors prior to relocation of the roadside station, the number of people with poor self-rated health decreased in the user group. Thus, such commercial facilities as roadside stations, which give users an opportunity to go out and meet people, can provide a "naturally healthy" environment.