27 60 T T T Tr T T T T BH 8 T BW o NW e + - OS 30K FEMALES — wbea -30F20F # 10h wo4 Hwee + . oc wee M -20 a ad “oO i i od " 8-15 A. _ 215§-40 ert, AGE GROUPS Figure 29, Platelet cumulative percent distribution curves for exposed compared with unexposed population. = _W L ~' | PLATELETS si074 uw wee 2a 60 ewe 240 d ea | t } 50 Lott Lt \ 40 1 wec wn } x” dt = H-HEMATOCRIT L 20 fT wn win AQ P-PLATELETS 10 E r N- NEUTROPHILS L- LYMPHOCYTES ] 0 Loy 70 4 8) 20 © 1 ao AGE L 40 50 60 AGE (YEARS) 20 z aeons. 441 CONTRO J on EXPOSED TIME MAXIMUM OE BRESSI0 (26-30 BAYS} r BW WBC- WHITE CELL COUNT 0 = _ TiME OF MAXIMUM DEPRESSION $ MALES 10 w 8 T HEMATOCRIT (%) sa n & 3 SK u BN TTTTTy TTT 20 Figure 28. Platelet counts of exposed Rongelap females plotted against age. Solid line represents mean level of unexposed female population. 20 T 20 = io SOF T sor 7 27 24 ra 7 CUMULATIVE PERCENT 3 S T T j J od | 6 T 33 fi 35 36 TMT PLATELETS «l0°* 43 42 trritt 51 46 TTT 34 T T FEMALES 7 4 57 50 60 (YEARS) tO 60 ence of peripheral blood elements in exposed com- Figure 31. Hematocrit values of exposed males plotted against age. Solid line represents mean level of unexposed male population. Morphology of Blood Cells Children of Exposed Parents Examination of peripheral blood smears showed no unusual cellular morphology in cither the exposcd or controls. A few bilobed lymphocytes were seen in the differential smcars of both exposed and unexposed people but no counts were made. Price-Jones curves in the past have showna slight microcytic tendency in the red cells. Bone marrow smears were obtained on 9 exposed Rongelap people. These examinations showed a reduced M/E ratio in 8 of 9 cases with abnormalities of the erythroid and mycloid precursors in 5 marrows (see Table 11). Peripheral blood elements of 24 children with parents one or both of whom had been exposed were compared with those of 50 children with unexposed parents. These children were <8 yr of age. The results are presented in Table 12 and Figure 37. There appeared to be a slight depression of Ieukocytic clements in both male and female children of exposed parents but a slight increase in platelets. Thus the findings reported last year of male children (but no female) of exposed parents showing depression of all blood elements is not substantiated in this year’s findings. Figure 30. Sex and age distribution of percent differpared with unexposed groups. von