[Correlation of labor onset, membrane rupture and birth with meteorological events]

The birth-physiological events: beginning of labour, rupture of membranes and delivery of 6 539 cases in the years 1976 to 1981 can be correlated with five groups of weather situations: no definite pressure gradient, anticyclonic, meridional, zonal mild maritime, and cyclonic.

temporary increase of the frequency of births in weather with no definite pressure gradient in summer, in anticyclonic weather in winter and in cyclonic weather in the first half of the year, correspond only partly (namely for the changes within the group of cyclonic weather) with the temporarily increasing number of births during a weather front, as it ist known from experience. The causes of the correlations found out are unknown, and the setting up of a statistical model and consequently an obstestrical-metereological forecast is impossible for the time being.