1] Table 6 Mean Blood Count by Age and Sex for the Exposed and Control Groups Unexposed Rongelap Rongelap Ailingnae Utirik WBC (10% ) 3-5 >) 8.6 (8)*=1.8 6.9 (54) 41.7 12.1 (2) 7.0 (16)+£1.6 10.8 (13) 3.5 7.8 (108)+3.2 Neutro (10°) 3-5 4.1 +17 5.9 3.9 +13 4.1 1.5 2.7 4.0 3.4 +111 3.7 2.7 +0.6 +0.8 5.6 2.6 +0.6 4.4 3.3 +£1.8 +1.3 4.7 2.9 +15 +0.8 0.7 +0.9 +0.4 0.7 1.4 +0.6 5.8 2.8 7.4 #2.7 6.2 4.0 #5.5 +2.6 >5 3.7 Lymph (10°) 3-5 >35 Mono (10°) _ 3-35 +11 1.2 >5 Eosin (10° ) 3-5 >5 Platelets (10' ) Males 3-10 > 10 Females > 3 Hematocrit Males 3-10 >15 Females > 3 +0.9 3.0 0.7 +0.4 0.7 +0.5 6.4 4.5 +2.2 +3.0 5.3 3.7 +2.3 9.6 0.8 9.8 (5) +1.6 6.9 (80)41.5 1.4 +0.6 32.0 (9) +5.6 22.1 (20)5.3 28.1 (33)+6.8 40.8 (2) 22.4 (5) +3.8 31.2 (11I)+6.9 39,5 (18) +8.8 28.3 (35) +6.2 31.2 (67) 47.3 32.6 (10)#7.0 26,9 (40)+5.5 30.0 (34):7.7 35.6 (13) 42.4 38.7 (16)+43.2 35.4 (33)+2.6 37.5 (2) 40.6 (5) 1.5 36.5 (11) 43.2 37.0 (21) +3.8 40.2 (31) 42.4 35.9 (68) £2.9 35.6 (17} 42.4 41.0 (34)+3.1 35.9 (34)2.4 *Numbersin parentheses refer to numbersof people in age groups. sex.* The hematological data are presented in tabular form in Table 6 and graphically in Figures 7 to 15. The meanof three separate absolute blood counts on the individuals was used in obtaining the over-all mean for comparison among various groups. WBC. The mean total leukocyte counts were about the same in the exposed and nonexposed Sex *Leukocytes: Platelets: Hematocrits: both <5 M <10 both 8 56 9 2 16 2 5 80 10 >10 all ages 22 33 5 11 40 34 M > 15 19 5 34 M <15 all ages ani co — om >5 Unexposed Rongelap M F F csr Age,yr Rongelap Ailingnae 12 33 2 11 17 34 people (Table 6 and Figure 7). Comparison with last year’s counts shows the leukocytes to have droppedslightly in contrast to the steady increase seen at six months, one year, and twoyearsafter exposure. However, the present control groupalso showsa correspondingly lower mean than the control groups of previous years. The numbersof neutrophils were slightly higher than in the unexposed group in both the >5 and <5-year-old age groups (Table 6 and Figure 7). Figure 8 showsthe agedistribution of individual neutrophil counts compared to the meancontrol level. The counts are seen to be distributed about equally above and below the mean controllevel. Among the exposed people, 9 (14.5%) showed neutrophil counts below 2500, and 15 (17.6%) of the unexposed people showed countsatthis level. Comparedto last year’s level, the neutrophils have