51 Table 23 Mean Levels of Peripheral Blood Elements of Populations Under Study Neut. ( x 10°) WBC (x 10°*) Plat. ( x 107°) 1966 1965 1966 682%1.8(55) 6.2442.3(15) 8.05 + 2.3(99) — 3.694%1.2 (56) 3.77415 (16) — 3.864 1.8(125) 3.5741.4(54) 3.30%1.9(15) 4.45+1.8(98) — 1965 1965 1966 274+ 75*(56)** 342+ 95 (16) — 282 71(124) — —_ —_ — 7.391.7 (56) 7TAQ+L4 (16) — 7.344 2.2(124) exposed parent(s) 4162130 (48) — 10.17%2.5 (48) — 4.41+2.0 (48) _— unexposed parents 366+ 96 (69) _— 9.91426 (69) — 4.52419 (69) — Rongelap exposed Ailingnae exposed Uurik exposed Rongelap unexposed Rongelap children of Rongelap children of Rongelap exposed Ailingnae exposed Utirik exposed Rongelap unexposed Rongelap children of exposed parent(s) Rongelap children of unexposed parents RBC ( x 10°*) Het. (%) Lymph. ( x 10°") 1965 1966 1965 1966 1965 1966 2.99+0.8 (56) 2.7392%0.8 (16) — 2.82> 1.0( 124) 2.45%0.8(54) 2.31%0.9(15) 3.00+ 1'0(98) _— 40.2%48 (56) 39.645.0 (16) — 40.5+5.0( 124) 39 *43(,5) 39.7%4.6(15) 41.3+7.0(88) —_ 427457 (50) 4338453 (16) ~ 443453(111) — — — — 4.78+1.9 (44) — 37.143.5 (48) — 44441 (44) — 4.5521.5 (69) — 36.4+2.4 (69) — 439+34 (64) — *Standard deviation. **Numberof people in group. until the organor tissue shows advanced morbidity. It is hoped that longitudinal studies of aging criteria in Rongelapindividuals and groups may be more rewarding as time goes by. levels for entire groups, compariaens are also made of age and sex groups. Ages 12 to 15, >15 to 40, and >40 years for each sex are compared. The hematological data are summarized in Table 23 and in Figures 49 through 65. In Ap- HEMATOLOGICAL STUDIES pendices 8, 9, and 10 are presented susnmaries of Hematological data are summarizedin tables andfigures below, and the raw data on individuals are przsented in the appendices. The more heavily exposed Rongelap group whoreceived 175 rads are designated as ‘“‘Rongelap exposed,” the Rongelap people whoreceived a smaller exposure of 69 rads as “‘Ailingnae exposed,” and the larger un- exposed comparison population of Rongelap as “unexposed.” Because of the small number of people in the Ailingnae group, their data were not treated as fully as those for the Rongelap groups, and are briefly summarized in a separate paragraph. The Utirik data are summarized separately also. Because of certain differences noted in age and sex groups between the exposed and the unexposed, in addition to the comparisons of mean the mean blood counts of the exposed populations and of the various comparison populations since exposure in March 1954. In Appendices 11 and 12 are listed the individual blood counts for 1965 and 1966. In Appendix 13 basophil counts are presented. In 1966, hematological studies (excluding platelets) were done only on the exposed populations of Rongelap, Ailingnae, and Utirik. Rongelap Population Leukocytes. The mean. beukocyte levels were slightly lower at 11 years than at 10 years post exposure in both exposed and unexposed Rongelap people. At 12 years the exposed (unexposed not done) showed slightly lower levels than in 1965 (see Appendix 8). There was no appreciable difference in the exposed and unexposed leukocyte