Table 2

Number of pregnancies by age and year at the start of pregnancy, and number of person years in the follow up by age and year

Age
Year141516171819Total
*The observation period ends in February 1998 and we present the data for the two first months of 1998 jointly with that for the year 1997. †In the statistical analyses data were used to the precision of month. The person years in this table are rounded to the nearest integer.
Number of pregnancies
    19873318275274177
    19880915343967164
    19892521345882202
    1990194394469166
    19913122135101120292
    1992110103840103202
    199335443175103261
    1994010176273136298
    1995372142124155352
    199606123474152278
    1997/1998*172640125152351
Total178320941680512132743
Number of person years†
    198780090184694593110315454
    1988182953897100394010955071
    198936139610861067112911055143
    19902153963951109106211464323
    19911121119112301298178618638489
    1992198129011911381129019057254
    199310661168219721832214217511003
    1994218123211652365217323499502
    1995795832188218502819267110848
    19962129038301993184228738652
    1997/1998*7721178149720042581333811370
Total5938104411321617198187672154987108