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JICOSH Home > Statistics > Results of Industrial Accident Trend Survey - Terminology
Statistics in Japan

Results of Industrial Accident Trend Survey
- Announced by the Ministry of Health, Labour and Welfare

Terminology

The "frequency rate" is defined as the incidence of industrial accidents as expressed by the number of casualties per million actual man-hours.

Calculation formula:

(Number of persons killed or injured by industrial accidents) x 1,000,000
(Total working hours)

The "severity rate" is defined as the seriousness of accidents as expressed by the lost working days per 1,000 actual man-hours.

Calculation formula:

(Lost work days) x 1,000
(Total working hours)

"Lost work days" is defined as the number of work days lost by industrial accidents.
 
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