What does the 28 mean? For what population? For what year? This is the same table as Table 3.8 of the CDC epidemiology textbook, which is located here

https://www.cdc.gov/csels/dsepd/ss1978/lesson3/section3.html

Table 3.5 All-Cause and Unintentional Injury Mortality and Estimated Population by Age Group, For Both Sexes and For Males Alone - United States, 2002 All Races, Both_sexes All Races, Males Age group Unintentional Estimated Pop. Unintentional Estimated Pop. (years) All_causes Injuries (* 1000) All_causes Injuries (* 1000) 0-4 32,892 2,587 19,597 18,523 1,577 10,020 5-14 7,150 2,718 41,037 4,198 1713 21,013 15-24 33,046 15,412 40,590 24,416 11,438 20,821 25-34 41,355 12,569 39,928 28,736 9,635 20,203 35-44 91,140 16,710 44,917 57,593 12,012 22,367 45-54 172,385 14,675 40,084 107,722 10,492 19,676 55-64 253,342 8,345 26,602 151,363 5,781 12,784 65+ 1,811,720 33,641 35,602 806,431 16,535 14,772 Not stated 357 85 0 282 74 0 Total 2,443,387 106,742 288,357 1,199,264 69,257 141,656 Data Source: Web-based Injury Statistics Query and Reporting System (WISQARS) [online database] Atlanta; National Center for Injury Prevention and Control. Available from: httpsWWwww.coc gowwyury/wisgarsTable 3.8 Number, Proportion (Percentage), and Ranking of Deaths for Leading Causes of Death, All Ages and 25-44 Year Age Group - United States, 2003 All ages Ages 25-44 Years Number Percentage Rank Number Percentage Rank All causes 2,443,930 100 128,924 100 Diseases of heart 684,462 28 16,283 3 Malignant neoplasms 554,643 22.7 2 19,041 14.8 2 Cerebrovascular_disease 157,803 6.5 3 3,004 2.3 8