Circadian and circaseptan patterns of natality and perinatal mortality of infants with different birth weights

OBJECTIVE. Data on human natality, stillbirth and perinatal mortality from Switzerland (1979-1987), available in four birthweight categories, are reexamined to assess any about-weekly (circaseptan) and changes in about-daily (circadian) patterns in central Europe over a century and a halfDESIGN. Retrospective analyses on archived data.SETTING. Federal Office of Statistics for Switzerland.RESULTS. In addition to prominent circadians, weekly patterns are also documented.CONCLUSION. Exogenous variations, prominent in early extrauterine life, such as changes of scheduling in obstetrics, may contribute to circadian and cireaseptan natality patterns. Information on these patterns serves in the optimization of neonatal care. Partly endogenous, partly physical environmental aspects, at least of about-weekly patterns, remain to be elucidated in series consisting exclusively of spontaneous parturitions.

Venezuela, summary of biostatistics. Maps and charts, population, natality and morality statistics.

Loose-leaf; reproduced from type-written copy.

Nicaragua, summary of biostatistics. Maps and charts, population, natality and mortality statistics.

Reproduced from type-written copy.

Peru, summary of biostatistics. Maps and charts, population, natality and mortality statistics.

Reproduced from type-written copy.

Uruguay, summary of biostatistics. Maps and charts, population, natality and mortality statistics.

Reproduced from type-written copy.

Cuba, summary of biostatistics : maps and charts, population, natality, and mortality, statistics /

Limited cataloging.

Argentina, summary of biostatistics. Maps and charts, population, natality and mortality statistics.

Reproduced from type-written copy.

Bolivia, summary of biostatistics; Maps and charts, population, natality and mortality statistics,

Mode of access: Internet.

Colombia, summary of biostatistics. Maps and charts, population, natality and mortality statistics.

Reproduced from typewritten copy.

El Salvador, summary of biostatistics. Maps and charts, population, natality and mortality statistics.

Reproduced from type-written copy.

Costa Rica, summary of biostatistics. Maps and charts, natality and mortality statistics.

"Bibliography for Costa Rica" : p.5-10.

Dominican Republic, summary of biostatistics. Maps and charts, population, natality and mortality statistics.

Reproduced from type-written copy.

Teen mothers natality statistics.

Mode of access: Internet.

Teen mothers natality statistics.

Mode of access: Internet.

Teen mothers natality statistics.

Mode of access: Internet.