A longitudinal study began in 2005 with 600 men and 600 women. In each sex, exactly 200 individuals fell in each of three age brackets as of 2005: B1 = 20 to under 30, B2 = 30 to under 40, and B3 = 40 to under 50. Each individual was followed until death or until 2025. The bar chart shows, grouped by each cohort's 2005 age bracket and by sex, the number still alive in 2015 and in 2025. All 1,200 originally-tracked individuals were alive in 2005.
In 2025, what was the ratio of the number of men who had died to the number of women who had died (among those tracked)?