Incidence and predictors of first-year unplanned discontinuation of Implanon at Ayder comprehensive specialized hospital, northern Ethiopia: A retrospective follow-up study

Background Discontinuing contraception without switching to a different type of family planning (FP) method contributes to unwanted pregnancy and unsafe abortion. Unplanned discontinuation of Implanon (which is discontinuation of Implanon without switching, but not for reasons of wanting to get pregnant) during the first year and its possible determinants have not been well investigated in Ethiopia. Therefore, this study aimed to determine the incidence and predictors of unplanned discontinuation of Implanon during the first year. Methods A retrospective follow-up study was conducted among 413 consecutive series of eligible women at Ayder Comprehensive Specialized Hospital in Northern Ethiopia. Data were drawn from both FP initiation and removal registration books and from contacting users by phone over a one-year period (April 2016 and March 2017). The inclusion of the categorical predictor in the final Cox model was considered if the test had a P-value of <0.25 in the log-rank test. We identified predictors of time to unplanned discontinuation using a multivariable Cox regression analysis. Adjusted hazard ratios with 95% confidence intervals (CI) were used to assess the association of covariates with the risk of discontinuation. There were no statistically significant interaction terms and proportionality assumption was fulfilled. Results The unplanned discontinuation rate of Implanon during the first year was 18.2%, with an incidence density of 16.3 discontinuations/1000 women-months. Compared with those under 20 years of age, women aged 20 to 24 years (AHR = 0.42; 95% CI: 0.19-0.91) had a protective effect against discontinuation. On the other hand, clients whose partner's educational level was lower than secondary (AHR = 2.20; 95% CI: 1.08-4.49) and who had never used any modern contraception method before (AHR = 3.26; 95% CI: 1.61-6.61) had a higher risk of discontinuation. Conclusions Our findings have significant implications for understanding why Implanon is discontinued in an unplanned manner, and will help policy makers plan the interventions needed to improve Implanon continuity by overcoming identified barriers. Providers in similar settings should pay more attention to clients whose partners have lower educational status and who are new acceptors.