Search PubMed⌕ Search

Biomedical subjects

J Staszewski

Publications and source records attributed to J Staszewski.

At least 19 recordsLinked to original sources
PubMed1994

The relationship between age and major league baseball performance: implications for development.

Lifetime performance data of 388 baseball players active in 1965 were analyzed to determine the age of peak performance for skills required to play baseball, to derive age-performance curves for athletic productivity, and to assess the magnitude of individual differences among elite and less able players. Cross-sectional and longitudinal analyses show that athletic performance on key indicators rises relatively quickly from age 19 to a peak age of 27 and then declines. The primary difference between elite and less able players is that performance of the elite players remains high for a longer period of time and decays more gradually. The performance of the most elite players is superior to that of less able players even at very early ages. These results parallel findings reported for other achievement domains and can be explained in terms of basic developmental processes involving the interaction of experience, physiological capacity, and motivation.

Adolescent↗
PubMed1991

The epidemiology of prostatic cancer. Geographical distribution and time-trends.

Prostate cancer is one of the most frequent tumours in males. Globally about 235,000 new cases were estimated to occur in 1980. The cancer is particularly frequent in North America, where rates in blacks are often double those in whites, and in several European countries, being rare in much of Asia. After migration to the US, Chinese and Japanese show substantial increases. Incidence may be distorted by inclusion of varying numbers of so-called 'latent' cancers; for some comparisons mortality data are preferable. 'Small' latent cancers seem to be uniformly distributed irrespective of the incidence of the clinically manifest form. The incidence of prostate cancer seems to be increasing in most populations, particularly in Asia and Eastern Europe. In general, mortality follows suit. Birth cohort analysis shows that for US non-whites, cohorts born before 1896-1900 showed an increase in mortality for all age groups, but the death rates fell for cohorts born subsequently, a phenomenon also observed in Australia and England and Wales.

Adenocarcinoma↗
PubMed1979

Cancer mortality in 1970-1972 among Polish-born migrants to England and Wales.

The 1970-72 cancer mortality of Polish migrants to England and Wales is compared with the cancer mortality prevailing in England and Wales and in Poland. Small numbers limit the analyses to the most frequent cancer sites only. The main findings are: (a) Compared with mortality rates in both their country of birth and of adoption, Polish migrants displayed intermediate values for cancers of the stomach, intestinal tract, and lung. For age-groups over 74 years, lung-cancer mortality among the migrants appears, however, to be higher than in both Poland and England and Wales. (b) A distinctly higher mortality among Polish migrants than either in Poland or England and Wales was apparent for lymphomas in both sexes, and for leukaemia and oesophageal cancer in males. (c) Female breast-cancer mortality among Polish migrants was much higher than in Poland, being close to the high mortality rates prevailing in England and Wales. The present findings are compared with the results of similar studies of Polish migrants to the United States and Australia and reasons for observed differences are advanced.

Adult↗
PubMed1974

Cancer of the upper alimentary tract and larynx in Poland and in Polish-born Americans.

Mortality for cancers of the buccal cavity and pharynx, oesophagus and larynx in Poland in 1959-72 was analysed and compared with cancer incidence registered in the selected regions of Poland, with cancer mortality and incidence in other countries, and with mortality among Polish-born migrants to the U.S.A.The patterns of occurrence of these cancers in Poland appear to be similar to those of other European and American countries, except perhaps for the rather high and still increasing incidence of laryngeal cancer. Among male Polish migrants, however, mortality for these cancers was distinctly higher than either in Poland or among native Americans. This contrast, largest for oesophageal and laryngeal cancer, decreased between 1950 and 1959-61, but only for those aged below 65. Similarity of these shifts with those observed for lung cancer is stressed and explanations are looked for. Factors associated with the studied cancers and outlines for the further studies are discussed briefly.

Adult↗