Outcomes included pregnancy; adverse effects or events (bleeding, injection site reactions, mental health concerns); initial use of injectable contraception (contraception uptake); and continuation rate of injectable contraception. Two reviewers extracted the data and assessed trials for bias. The authors used random-effects models to calculate pooled relative risk (RR) for studies with the same outcomes.
The analysis included a total of 6 trials (N = 3851): 3 RCTs (n = 1263) and 3 controlled cohort studies (n = 2588), conducted in the United States (2 trials), Malawi, Scotland, Uganda, and Senegal. All studies compared 12-month continuation rates of self-injected DMPA-SC vs provider-administered DMPA-SC or DMPA-IM every 3 months (12-13 weeks, with a window for early and late injections). Participants were at least 15 years of age (mean range, 26 to 29 years). In some studies, reminders (eg, texts, emails, calendar notifications) were provided to either the self-injection cohort only or to both cohorts of the trial. The RCTs were generally graded as having a low risk for bias, except for nonblinding of participants and personnel, given the nature of the interventions. The authors reported no evidence of significant heterogeneity in the studies.
The meta-analysis found higher continuation rates at 12 months with self-administrated DMPA compared with provider administration in the RCTs (RR = 1.27; 95% CI, 1.16-1.39) and in the observational cohort studies (RR = 1.18; 95% CI, 1.10-1.26). Pregnancy outcomes were reported in 4 studies, with the meta-analysis finding no significant difference in pregnancy rates in 2 RCTs (RR = 0.58; 95% CI, 0.15-2.22) or 2 observational cohort studies (RR = 1.1; 95% CI, 0.23-5.26).
Adverse effects or events were reported in 4 studies: 2 cohort studies reported increased injection site reactions with self-administration, and 1 RCT reported increased injection site pain or irritation with self-administration at 3 and 9 months. No other reported adverse effects occurred at higher rates with self-administration vs provider administration.
WHAT’S NEW
Demonstrated effectiveness of self-administered formulation
This systematic review and meta-analysis demonstrated that self-administration of DMPA-SC leads to higher contraception continuation rates at 12 months, without notable increased pregnancy rates or adverse effects, when compared with provider-administered DMPA.
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