The total observation person-years of the 704 workers was 6,215.5, and the incidence rate of Raynaud’s phenomenon in the 39 subjects was 6.27 persons per 1,000 person-years for the 27-year observation period.
The total observation person-years of the 704 workers was 6,215.5, and the incidence rate of Raynaud’s phenomenon in the 39 subjects was 6.27 persons per1,000 person-years for the 27-year observation period.