an analysis of the data shows that the normal chance of breakthrough bleeding on a particular day when one oral contraceptive tablet is not missed on the previous day is 0.017 , 0.022 , and 0.022 for ovral , norinyl , norlestrin users , but the chance on the day after a contraceptive tablet is missed increased by 13 to 16 times for each of the three ocs .
C0993159
oral
C0039225
tablet