Table 1

Number (percentage) of person years of use of oral contraceptives in study population according to age groups during study period 1 (January 1993 to October 1995) and study period 2 (January 1996 to December 1999)

Oral contraceptiveAge 15-19Age 20-24Age 25-29Age 30-34Age 35-39Total
Study period 1
Levonorgestrel4 800 (17.9)19 600 (28.9)28 200 (42.2)21 800 (46.8)9 200 (44.5)83 600
Third generation22 200 (82.1)48 200 (71.1)38 600 (57.8)24 700 (53.2)11 500 (55.6)145 200
Total27 10067 80066 80046 40020 700228 900
Study period 2
Levonorgestrel14 300 (88.6)26 200 (78.9)30 800 (79.5)24 600 (83.7)12 300 (82.0)108 100
Third generation1 800 (11.4)7 000 (21.1)8 000 (20.6)4 800 (16.4)2 700 (18.0)24 300
Total16 10033 20038 80029 40015 000132 500