Estimated Medical Cost Savings in New Hampshire by Implementation of a Primary Seat Belt Law
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Summary
This report estimates the medical cost savings for New Hampshire resulting from the implementation of a primary seat belt law. The study was motivated by the high financial burden of motor vehicle crash injuries on state budgets, private insurers, citizens, and the federal government. While seat belts are known to significantly reduce the risk of death and serious injury, New Hampshire lacked an adult seat belt law at the time of the study. The authors aimed to quantify the minimum direct medical savings expected from transitioning to a primary enforcement law, which allows police to stop drivers solely for seat belt violations. The analysis utilized 2005 New Hampshire hospital discharge data, identifying 639 patients admitted for injuries caused by motor vehicle crashes. To estimate total medical costs, the authors adjusted direct hospital charges using cost estimates from the National Highway Traffic Safety Administration’s *Economic Impact of Motor Vehicle Crashes* report. These costs were mapped to injury severity levels using the Maximum Abbreviated Injury Scale (MAIS) and body region classifications derived from ICD-9 codes. The estimates were adjusted for inflation to reflect 2008 costs and calculated conservatively to serve as a lower-bound estimate. The study assumed that a primary law would increase seat belt usage by 14.5 percentage points, based on National Highway Traffic Safety Administration projections that 40% of current non-users would begin wearing belts. The effectiveness of seat belts was weighted at 48% for reducing serious injuries in passenger cars and light trucks. The results indicate that implementing a primary seat belt law would generate substantial medical cost savings in the first year alone. Insurance companies would experience the largest reduction, with estimated savings of approximately $5.1 million. Citizens of New Hampshire would save $1.2 million, while the federal government would reduce its expenditures by $1.2 million, primarily through Medicare. The state of New Hampshire would reduce its spending by more than $400,000, with gross savings estimated at $800,000 when accounting for federal Medicaid reimbursement. In total, all payers combined would save at least $7.9 million in direct medical costs. The authors conclude that these figures represent conservative underestimations, as the study excluded peripheral costs such as lost wages, productivity losses, and the value of human life. Additionally, the analysis did not account for the higher likelihood of unbelted occupants being Medicaid patients or the potential for increased savings over time as medical costs rise. The findings suggest that adopting a primary seat belt law would provide significant financial benefits to the state, its residents, and other stakeholders by reducing the burden of crash-related medical expenses.
Key finding
Implementation of a primary seat belt law in New Hampshire would generate at least $7.9 million in annual medical cost savings, with insurance companies saving $5.1 million and the state saving $400,000.
Methodology
dataset
Sample size: 639
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 24 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: crash risk outcomes