Table 1_Age-specific patterns of all-cause mortality across COVID-19 booster dose groups i

Yasushi Iwamoto's exploratory analysis uses municipal administrative registry data from Hamamatsu City (2021–2024) and Matsudo City (2021–2025). The dataset includes age group, sex, residence date, COVID-19 vaccination records, and date of death for individuals aged 20–89 years. It calculates all-cause mortality rates per 100,000 person-years across different vaccine dose groups.

Use Cases

• Exploratory analysis of age-specific mortality patterns based on vaccination dose counts mentioned in the description.
• Comparison of all-cause mortality rates across different age cohorts (20–49, 50–64, 65–89 years) based on the study's methodology.
• Descriptive study of vaccine safety signals using administrative registry data lacking clinical covariates, as noted in the limitations.

Strengths

• Data covers a multi-year time range from 2021 to 2025 across two municipalities.
• Includes individual-level records with age, sex, vaccination dates, and death dates.
• Analysis calculates mortality rates per 100,000 person-years, providing a standardized metric.

Limitations

• The dataset lacks information on comorbidities, healthcare utilization, socioeconomic status, and cause of death, preventing causal inference.
• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

Municipal administrative registry data from Hamamatsu City and Matsudo City, obtained via information disclosure requests.

Collection Method

Observational study using registry data; individuals categorized by age and vaccine dose count.

Time Range

2021 to 2025 (Hamamatsu: 2021–2024, Matsudo: 2021–2025).

Freshness

Last updated 2026-04-20 05:17:33; freshness should be verified.

Geography

Two Japanese municipalities: Hamamatsu City and Matsudo City.