In total, 37 DHS datasets were eligible for final inclusion in the study, and these were drawn from four sub-regions of SSA (Figure 1). The countries included 6 (16.2%) (Central African Republic, Chad, Congo, Congo Democratic Republic, Gabon and Sao Tome and Principe) from Central Africa, 7 (18.9%) (Burundi, Ethiopia, Kenya, Rwanda, Tanzania, Uganda and Comoros) from East Africa, 10 (27.0%) (Angola, Eswatini, Lesotho, Madagascar, Malawi, Mozambique, Namibia, South Africa, Zambia and Zimbabwe) from Southern Africa and 14 (37.8%) (Benin, Burkina Faso, Cameroon, Cote d'Ivoire, Gambia, Ghana, Guinea, Liberia, Mali, Niger, Nigeria, Senegal, Sierra Leone, Togo) from West Africa. Furthermore, 13.5% (n=5) had their latest DHS conducted between 1995/6-2010 cycle while 40.5% (n=15) and 45.9% (n=17) had their latest DHS conducted between 2011–2015 and 2016–2020 cycles, respectively.
Prevalence of Unmet needs
The overall pooled prevalence of unmet needs for family planning for all 37 countries in the four sub-regions of SSA was 22.9% (95% CI: 20.9–25.0). The prevalence varied across countries from 10% (95% CI: 10–11%) in Zimbabwe to 38% (95% CI: 35–40) and 38 (95% CI: 37–39) (I2 = 99.8% and p-value < 0.0001) in Sao Tome and Principe and Angola, respectively. Twenty-four countries had the prevalence of unmet needs for family planning approximately 20% and above. Of these, 4 countries (Congo Democratic Republic, Gabon and Sao Tome and Principe) were from Central Africa, 5 countries (Burundi, Ethiopia, Tanzania, Uganda, and Comoros) were from East Africa, 2 countries (Eswatini and Zambia) were from Southern Africa and 12 countries (Benin, Burkina Faso, Cameroon, Cote d'Ivoire, Gambia, Ghana, Guinea, Liberia, Mali, Senegal, Sierra Leone, Togo) were from West Africa (Figure 2). The total population of women who are married or in union aged 15 to 49 years from the 37 countries included in this analysis was 322,475. The country and regional prevalence of unmet needs for the 37 countries is illustrated in Figure 2.
Prevalence of limiting and spacing
The prevalence of unmet needs for family planning for limiting was 8% (95% CI: 7–9). The highest prevalence of unmet needs for limiting among the four sub-regions and within regional countries was observed in East Africa (Prev: 9%; 95% CI: 8–11) with Burundi having the highest prevalence (Prev: 14%; 95% CI: 13–14) while Kenya had the least (Prev: 8%; 95% CI: 8–9). Regionally, the lowest prevalence of unmet needs due to limiting was observed in Central Africa (Prev: 6%; 95% CI: 3–9) (Table 2). Overall, Niger (Prev: 3%; 95% CI: 2–3) had the lowest prevalence of unmet needs due to limiting while Sao Tome and Principe (Prev: 20%; 95% CI: 18–22) had the highest. The study further observed that the prevalence of unmet needs for family planning for spacing was 15% (95% CI: 14–17). The lowest prevalence of unmet needs for spacing among the regions was observed in Southern Africa (Prev: 12%; 95% CI: 8–16) while the highest was observed in Central Africa (Prev: 18; 95% CI: 16–21) (Table 2). Overall, Zimbabwe (Prev: 6% 95%; 5–7) had the lowest prevalence of unmet needs for spacing while Benin (Prev: 23%; 95% CI: 22–23) had the highest. A high level of heterogeneity (I2 =99%) was observed. Furthermore, there was no publication bias and the Doi plot shows an LFK index of (0.79) which indicates no asymmetry. This means that there were significant differences in the prevalence of unmet needs across countries and sub-regions in SSA. (Supplementary file 3).
Prevalence of unmet needs over time
The overall prevalence of unmet needs for family planning showed a decrease between the 1995/10 and 2011/15 waves. However, this decrease was not sustained as the prevalence increased from 21% (95% CI: 21–25) observed between 2011–2015 to 24% (95% CI: 21–27) in the 2016–2020 cycles. This trend was similar to the trend in the unmet needs due to limiting. A decrease in prevalence from 8% (95%: 4–13) to 7% (95% CI: 7–8) in 1995/10 and 2011/15 waves while in 2016–2020, there was an increase of 1% to that observed in 201/15 cycles. On the other hand, the prevalence of unmet needs for family planning due to spacing showed a 1% increase across the three periods. Between the 1995/10 and 2011/15 waves, the prevalence increased from 14% (95% CI: 9–19) to 15% (95% CI: 12–18) and later to 15% (95% CI: 13–18) in 2016–2020 cycles (Figure 3).