A study examining medical costs after minor traffic accident injuries and differences across medical providers

Concentration of Claimed Costs and Facility-Level Variation after Minor Injuries Following Motor Vehicle Accidents in Japan - MICRO-COST Japan Study: Minor Injury Cost Concentration Study in Japan

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

JPRN

Registry ID

JPRN-UMIN000061108

Enrollment

284139

Registered

2026-04-01

Start date

2026-02-01

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

cervical sprain, lumbar sprain

Interventions

None listed

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: The data provided by the General Insurance Rating Organization of Japan was used, and the selection criteria were as follows: (1) injuries resulting from a motor vehicle accident (rear-end collision, contact, or impact), (2) primary diagnosis of lumbar sprain, (3) medical treatment covered by compulsory automobile liability insurance, (5) compensation using compulsory automobile liability insurance completed between June 2014 and December 2019, and (6) damages due to injury of 400,000 yen or less with no permanent disability (a minor category in Japan's no-fault government compensation), or damages due to injury of less than 1,200,000 yen with permanent disability (a minor permanent disability in Japan's no-fault government compensation).

Exclusion criteria

Exclusion criteria: Exclusion criteria included patients who suffered fractures, dislocations, or spinal cord injuries during litigation related to traffic accidents, and those with missing data.

Design outcomes

Primary

Measure	Time frame
Total claimed costs from initial consultation to recovery	—

Countries

Japan

Contacts

Public ContactKeisuke Shimizu

Chiba University Future Medicine Education and Research Organization

kshimizu@chiba-u.jp0432262286

Outcome results