Impact of Primary Care Attributes on Hospitalization During the COVID-19 Pandemic: A Nationwide Prospective Cohort Study in Japan.

ABSTRACT

PURPOSE: During a pandemic, when there are many barriers to providing preventive care, chronic disease management, and early response to acute common diseases for primary care providers, it is unclear whether primary care attributes contribute to reducing hospitalization. We aimed to examine the association between core primary care attributes and total hospitalizations during the COVID-19 pandemic. METHODS: We conducted a nationwide prospective cohort study during the pandemic using a representative sample of the Japanese adult population aged 40 to 75 years. Primary care attributes (first contact, longitudinality, coordination, comprehensiveness, and community orientation) were assessed using the Japanese version of Primary Care Assessment Tool (JPCAT). The primary outcome measure was any incidence of hospitalization during a 12-month period from May 2021 through April 2022. RESULTS: Data from 1,161 participants were analyzed (92% follow-up rate). After adjustment for possible confounders, overall primary care attributes (assessed by the JPCAT total score) were associated in a dose-dependent manner with a decrease in hospitalizations (odds ratio [OR] = 0.37, 95% CI, 0.16-0.83 for the highest score quartile, compared with no usual source of care). All associations between each domain score of the JPCAT and hospitalization were statistically significant when comparing the highest quartile with no usual source of care. CONCLUSIONS: Our study revealed that the provision of primary care, particularly high-quality primary care, was associated with decreased total hospitalization, even during a pandemic when there are many barriers to providing usual medical care. These findings support policies that seek to strengthen primary care systems during and after the COVID-19 pandemic.