Table 1

 Oral contraceptive preparations taken by subjects

Pill type and manufacturernOestrogen (μg)Progestogen (μg)
Microgynon (Schering Health, Germany)730150
Brevinor (Searle, USA)235500
Ovarnette (Wyeth, Ireland)130150
Marvalon (Organon, Ireland)330150
Cilest (Janssen-Cilag, Switzerland)135250