Trends and predictors of changes in modern contraceptive use among women aged 15–49 years in Tanzania from 2004–2016: Evidence from Tanzania Demographic and Health Surveys

INTRODUCTION: Modern contraceptive use provides opportunities for women and couples to achieve optimal child spacing, achieve desired family size and reduce unsafe abortions. Despite these facts, modern contraceptive prevalence rate (mCPR) in Tanzania remains as low as 32%. This study aimed to determine trends and factors associated with changes in modern contraceptive use among women of reproductive age in Tanzania from 2004–2016. METHODOLOGY: This was a cross-sectional study utilizing data from Tanzania Demographic and Health Surveys of 2004–2005, 2010 and 2015–2016. Data analysis was performed using Stata version 14. Analysis considered the complex survey design through application of weights, clustering and strata. Multivariable Poisson decomposition analysis was used to assess factors associated with changes in modern contraceptive use. Results were presented in the form of decomposition coefficients and percentages. RESULTS: Modern contraceptive use increased from 23.0% in 2004 to 34.3% in 2016. Differences in women’s characteristics contributed 12.5% of the increase in mCPR. These characteristics include partner’s education levels, recent sexual activity and being visited by a family planning worker. The difference in coefficients contributed 87.5% increase in mCPR. The most increase in modern contraceptive use was attributed to rural population (44.1%) and women who experienced a termination of pregnancy (7.1%). CONCLUSION: Modern contraceptive use has steadily increased in Tanzania. Health policies and interventions need to target sexually active women, rural residents as well as less educated women and men to maintain and further accelerate the trends in mCPR. Interventions focusing on women who experienced a termination of pregnancy may also serve as an entry point to promote use of modern contraceptive methods.