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According to an official Chinese report, the population of China has increased from 540 million in 1949 to 960 million in 1978, an average annual rate increase of about 20 per 1,000 population. In view of adverse socio-economic effects of the rapid population growth in the past the Chinese Government has recently begun encouraging the one-child family in an attempt to achieve the target of zero population growth by the turn of this century, as part of the effort to promote the Four Modernizations in the fields of agriculture, industry, science and technology, and defence.

SummarySeasonal or monthly fluctuations in suicides and homicides were analysed using US mortality data for the years 1969–78, using periodic regression analysis. The results were generally consistent (year-to-year) over the 10-year period. The pattern for suicide was distinctly seasonal: it was above average all spring and below average all winter. For homicides, the pattern was more monthly, with July–September and December being above average times and January–June being below average.