Probability of Continuation: With Triphasic and Monophasic (LD)

Introduction: despite the same complications for ld and triphasic pills, it seems as if the continuation times for the two birth control methods are different.aims: to compare the continuation times and side effects of triphasic and monophasic ld use, and identify factors related to continuation and discontinuation.methods and materials: a historical cohort study was conducted in isfahan, iran to determine and compare the probability of 5 years continuation of low dose monophasic (223) and triphasic (163) use among 386 reproductive married women. statistical analysis used: the continuation time of triphasic pill and ld pills were compared with kaplan meier by spss11.5 software.results: the cumulative proportion of continuation was significantly different between triphasic and ld groups in the first year of use [0.98 (ld) vs 0.84 (tri phsic)]. it was found that age, number of living children, education level and employment status didn’t have any role in choosing contraceptive method (p>0.05). in each group there was a significant relationship between these variables and median duration of ocp use. despite similar complications and total discontinuation, 5 year continuation time of triphasic was lower than that observed for ld.conclusions: it seems as though consumption of triphasic ocp requires more attention, as it should be taken on a regular schedule, and missing a dose for more than two hours reduces its efficacy. therefore, health care professions should consider more factors before offering clients triphasic pills in order to reduce discontinuation time