By E. Grebenik (auth.), J. E. Meade C.B., M.A., F.B.A., A. S. Parkes C.B.E, M.A., SC.D., F.R.S. (eds.)
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Additional info for Biological Aspects of Social Problems: A Symposium held by the Eugenics Society in October 1964
E. ' 13year-olds' centred at 13·5 years, not 13, as in some of older literature) (from Tanner 67). SECULAR TREND IN AGE AT MENARCHE 49 POPULATION TRENDS his conclusion that in Norway puberty was brought forward by about three years between 1830 and 1930 is entirely in accord with the data on menarche. AGE AT MENARCHE The trend towards earlier maturing during the last hundred years is perhaps best shown by statistics on the age ofmenarche. A selection of the best available data is illustrated in Figure 5.
The flatter generation development now disclosed, and the absence of a long-term secular factor, are not inconsistent with an association with smoking, bearing in mind that the differente between the smoking ofmen and warnen has probably increased less rapidly than the smoking of either. But the experience TABLE XIII COMPARISON OF PATIERNS BY FACTORS BY AGE AND YEAR OF ßiRTH WITH THOSE OBTAINED BY ßEARD CENTRAL AGE 37 42 47 52 57 62 67 72 77 82 Beard Cox 2 5 12 27 56 100 155 202 260 287 I 5 9 22 50 100 211 329 725 1438 YEAR OF BIRTH 1846 1856 1866 1876 1886 1896 1906 1916 Beard I 2 4 10 28 43 63 69 Cox I 3 4 10 25 30 27 27 cannot be dissected so neatly and convincingly as that in respect of lung cancer by Beard.
3. The age at menarche, or first menstrual period, in girls. The age offirst appearance ofpubic hair in boys is a less reliable index of maturity, and one that has been less studied. arge it is. I will then discuss the possible reasons for this trend. 9 I have chosen these data for illustration since they are very extensive (8500 40 41 POPULATION TRENDS CM. 180 HEIGHT GIRLS 170 10 AGE, YEARS 150 16 14 18 AGE, YEARS LB. 140 12 LB. f GIRLS IJO 120 110 100 90 80 10 IZ 14 16 18 10 AGE, YEARS IZ 14 16 18 AGE, YEARS FIGURE 1 SECULAR TREND IN GROWTH OF HEIGHT AND WEIGHT Height (above) and weight (below) of Swedish girls and boys measured in 1883 and in 1938-39.
Biological Aspects of Social Problems: A Symposium held by the Eugenics Society in October 1964 by E. Grebenik (auth.), J. E. Meade C.B., M.A., F.B.A., A. S. Parkes C.B.E, M.A., SC.D., F.R.S. (eds.)