32 group whoreceived 175 rads are designated as “Rongelap exposed,” the Rongelap people who slightiv at the time of the 9 and 10-year surveys in population of Rongelap as “unexposed.” Because years the neutrophil levels were about 5% lowerin the exposed than in the comparison group, but at group,their data were nottreated as fully as those levels are shown in Figures 23 through 29. The rized in a separate paragraph. The Utirik data are summarized separately also. Because of certain younger age groups (<_40 years). The exposed older age groups (>40 years) did not share the deficit as much as has been noted in the past (Figures 26 through 29), LympHocytes. Lymphocyte levels were slightly higher in the exposed and unexposed groups during the 9 and 10-year surveys. In contrast to the 8-year survey results, the lymphocyte mean levels showedlittle difference between the exposed and unexposed groups during the 9 and 10-year surveys; however, some individual lymphocyte counts were lowerin the exposed group. Lymphocytelevels are shown in Figures 24, 25, and 30 through 34. Neutropuits. both exposed and comparison populations. At 9 received a smaller exposure of 69 rads as “Ailingnae exposed,” and the larger unexposed comparison 10 years they were about 20% lower. Neutrophil of the small numberof people in the Ailingnae neutrophil deficit was greater in the exposed for the Rongelap groups, and are briefly summa- differences noted in age and sex groups between the exposed and the unexposed, in addition to the comparisons of meanlevels for entire groups, comparisons are also made of age and sex groups. Ages 9 to 15, 16 to 40, and >40 years for each sex are compared. The hematological data are summarized in Tables 18 and 19 and in Figures 23 through 49. In Appendices 1, 2, and 3 are presented summaries of the mean blood counts of the exposed populations and of the various comparison populations since exposure in March 1954. In Appendices 4 and 3 arelisted the individual blood counts for 1963 and 1964. In Appendix 6 basophil counts are presented. . Rongelap Population. Leukocytes. Mean levels of leukocytes in both exposed and comparison populations at 9 years post exposure wereincreased over the 8-yearlevels, and the 10-year t . r 7 * EXPOSED 9 YEARS POST EXPOSURE « UNEXPOSED « EXPOSED, TIME OF MAXIMUM DEPRESSION CUMUL ATIVE (%} 26-30 OATS! levels were higher than those for either of the two preceding years. The exposed group had only slightly lower leukocytes than the unexposed (—4%) at 9 years, and at 10 years, lower by 9%. Most of the difference was due to lower neutrophil leveis in the exposed group (see Figure 23). LEUKOCYTES AND NEUTROPHILS 410 7 The neutrophil levels increased : y g0F 1 / 60 i 40F 20F Ou ‘ 9.2040: L a 60480 0 NEUTROPHILS 107 | re Pog . ~ _ / boyy y / :j iv, = ~ , if? é —_ 25 ag 60 LYMPHOCYTES 11073 20 a0 wo PLATELETS «.Q* Figure 24. Cumulative percent distribution curves for neutrophils, lymphocytes, and platelets, 1963. 4 ! 1 _ ~~ a ~ vc ” + EXPOSES, TEN YEARS POST Ex*OgUeE : 4 : i 3st ones) z oor ' wo > 3 CONTRO, > EXPOSED, TIME OF MaxiMUM DEP ATSSION (3-89: OAYS) (26-39 ;Oars) 4 Py | | % 60b 7 - 23 aot t' . aor + ad pe S mw © Oars MBM! TIME GA MO AFTER po 5a 6 YEARS po 8 EXPOSURE Figure 23. Mean neutrophil and white blood counts of exposed Rongelap people from time of exposure through 10 years post exposure. Stars represent mean values of comparison population. ra ) : wo | oe 1 20 40 60 3890 NEUTS x107> 20 40 LYMPHS x 1073 Q 20040 50 PLATELETS «07 Figure 25. Cumulative percent distnbution curves for neutrophils, lymphocytes, and platelets, 1964.