33 EOSINOPHILS, MONOCYTES, AND Basopuits. The levels of these cells were not remarkably different between the exposed and unexposed groups and were similar to the levels in past surveys. PLaTELeTs. ~ The platelet levels in the 9 and 10-year surveys both revealed greater deficit in exposed males than in exposed females. Compared with the unexposed groups the males had 20% less in 1963 and 12% less in 1964, and the females 7% less in 1963 and 2% less in 1964 (see Figure 35). In the scattergrams(Figures 36 through 39) and the accumulative distribution curves (Figures 24 and 25) the differences are clearly shown. ERYTHROPOIETIC ELEMENTS. As in the past surveys no significant differences were noted in the red biood counts, hemoglobins, or hematocrits RO; . between the exposed and unexposed groups. Fig- ures 40 through 49 demonstrate this point. STATISTICAL ANALYsis OF RoNGELAP BLoop Data Over Past Four Years. These analyses are in progress, and the following represents a preliminary report by Mr. Keith Thompson of Brookhaven National Laboratory. “A factorial analysis of variance of unweighted means was madefor each of four blood compo- nents: platelets, white blood cells, neutrophils, and lymphocytes. For these preliminary analyses, the population was stratified into four factors: years (1961, 1962, 1963, and 1964), sex, exposed Ron- gelap versus nonexposed, and age (5 to 15, > 15 to +0, >40). Thus, for each of the blood components, main effects and interaction effects were : MALES 9364 NEUTROPHILS « 104 NEUTROPHILS «0? 1.1 MALES 1963 zo. + AGE (years) AGE (years) Figure 26. Neutrophil counts of exposed Rongelap males plotted against age. Solid line represents mean level of unexposed male popuiation, 1963. Figure 28. Neutrophil counts of exposed Rongelap maies plotted against age. Solid line represents mean level of unexposed male popuiation, 1964. 1 eb ~ ote NEUTROPHILS « 10> i 4 a) i FEMALES 1964 NEUTROPHILS «103 FEMALES i963 ~ Oo T ° 1 — — be 8.0; a 40 50 60 SGE (years) Figure 27. Neutrophil counts of exposed Rongelap [emales plotted against age. Solid line represents mean level of unexposed female population, 1963. AGE ‘years) Figure 29. Neutrophil counts of exposed Rongelaptemales plotted against age. Solid line represents mean level of unexposed female population, 1964.