19 -— STATURAL GROWTH 1958-6) gay AGE aT EXPOSURE (8075S) i709 | | i690 | 150 | 1 CONTROL GROUP 4 ---- EXPOSED GROUP @ AGE AT EXPOSURE Qe 2 INDICATED BY CIRLED NUMBER ~ COMPARISON OF SKELETAL AGE & CHRONOLOGICAL AGE 96! MEDIAN DIFFERENCE (SKELETAL AGE| Sal |MINUS CHRONOLOGICAL ace [ca]) : j E180K 2 \ ve ! = i 2 130-— a e wn |1 . Zi2ob 3a | lg ‘ = : -2f- CONTROL GROUP ea EXPOSED GROUP | 1 O-t 2-3 AGE 4-3 AT 4 L | 1 6-7 8-9 IQ-11 EXPOSURE Figure 15. at maturity. In addition, with respect to stature. 7 3 Wl i3 15 i? 9 CHRONOGLOGICAL AGE (YEARS) Figure 14. signed-rankstest!' were utilized in testing differences in these data. The more powerful Walsh test was used for the comparisons on children exposed at between 12 and 18 monthsof age because ofthe very small sampies involved. The Wilcoxon test was used for the comparisons on the other chiidren because the larger samples were bevond the functional range of the Walsh test. The Spearman rank correlation coefficient was utilized as the nonparametric measure of correlation. Comparisons were made (a) between the two sexes for each age separately, (b) between exposed and control groups for each sex and age separately, (c) between exposed and control groups for each age separately with the sexes combined, and (d) between exposed and control groups for each sex, age, and yearofbirth (or age at exposure) separately. These comparisons have been summarized graphically (Figures 8 to 15), and the results of the comparisons are shown in Tables 6 and 7. Height and weight data on children born before the fallout showed the expected pattern of pubertal growth spurt occurringearlier in girls than in boys and the eventual superiority in size of boys there was a distinct tendency, among the boys only, at <.12 years of age, for the exposed group to be shorter than the unexposed. This difference was prominent in boys exposed at <6 years and most marked among those exposed at age | vear, the latter being those aged 12 to 18 monthsat the time of the fallout. A similar trend, but much less distinct, was also noted in body weight among the boys. No such patterns in growth curve variations between exposed and control groups were noted amongthegirls. Among the children born after the fallout, the males with exposed parents were smaller in stature at all ages than those with unexposed parents. The difference was most marked at ages !, 3, and 4 years. The difference in stature was greatest in boys born <2 vears after the fallout. The magni- tude of the difference decreased with increasing age. No difference between children with and without history of parental exposure was noted for head circumferences and body weight. Although the growth data for children exposed in utero were examinedseparately, the small num- ber of individuals in this category prevented adequatestatistical analysis. Hereafter the children exposed in utero will be included in the group directly exposed to fallout. Roentgenogramsofthe left hand and wrist were obtained in 1959 and 1961. In the limited 1960 survey, no x-ray studies were done. The available roentgenograms were assessed by using the inspec-