VTE risk - women using CHC containing levonorgestrel, norethisterone or
norgestimate
5-7 VTE in 10,000 / year
VTE- Women using CHC containing etonogestrel or norelgestromin
6-12 VTE in 10,000 / year
VTE- Women using CHC containing drospirenone, gestodene or
desogestrel
9-12 VTE in 10,000 / year