Child marriage is defined as any legal or customary union involving a boy or girl younger than the age of 18 [1] while child marriage prevalence is the percentage of women 20–24 years old who were first married or in union before they celebrated their eighteenth birthday [14]. Despite the increasing global commitment and awareness by countries to halt the harmful practice of child marriage, it has been discovered that 15 million girls are married off before the age of 18 yearly in the developing world [8]. So, this study presented the proportion of young girls in Africa within age groups 15–19 and 20–24 years who are married along with the percentage of those within age 20–24 years who got married before age 15 or 18. Child marriage is not isolated to any continent, region, geographical, culture, or religion. It is widespread in numerous tribes and cultures across the world with the highest prevalence in sub-Sahara Africa [8].
In five African countries (Comoros, Mozambique, Niger, Ghana, and the Congo Democratic Republic) child marriage prevalence rate ranges from 32% in Comoros to 76% in Niger (Table 2). An estimated 32% of girls born between 1990 and 1994 were reportedly married before the age of 18 in Comoros which represents the least proportion of child marriages in Africa in 2017 while 10% were married before age 15. The high rate of this harmful practice may be attributed to the country’s low economy, high sexual violence, and limited educational opportunity for girls. Also, 18% of the Comoros population lives in rural areas and lives below the international poverty line [15]. Furthermore, nearly 13.9% of adolescent girls (15–19) in Comoros have experienced some form of physical or sexual assault [16]. Also, according to the net enrolment index, only 50% of girls of primary school age are given admission into the primary school [17]. Among the enrolled female primary school pupil, only a few progress to the university, as it involves travelling overseas to France or neighboring countries.
The percentage of older brides who married before age 18 in Nigeria (43%) is high due to the remarkably high proportion of girls who have no formal education (73%). These girls have little to no economic resources to sustain their livelihood and therefore end up getting married to men “older than their father”. Also, in some parts of Nigeria, girls are married off at young ages to enhance political and economic ties among the rich or pay back debt among the poor [18].
Mozambique, which is located in the Eastern part of Africa, has 48% of married women between ages 20–24 who were married before age 18. This country has the highest prevalence of child marriage among the African countries in the Global Program, with the except for the Sahelian countries of Burkina Faso and Niger [19]. The major drivers of child marriage, which is one of the most serious challenges against national development in Mozambique, are initiation rites linked to puberty among ethnic groups in northern and central regions [19, 20] and deteriorating economic situation due to flooding and other natural disasters [21]. This result is similar to the prevalence reported in Somalia (45%) due to the high rate of female genital mutilation, low investment in girl-child education, etc [22]. It was also observed that Bangladesh about 59% of wives between 20 and 24 years who married before age 18 [23]. This high proportion is attributed to the pressure on the central government from the conservative religious groups, coupled with high rates of natural disasters and poverty which makes the government unable to implement plans to reduce child marriage [19, 24].
Niger has the highest prevalence of child marriage in Africa among the countries surveyed. An estimated 76% of married women aged 20–24 were married off before the age of 18. This high proportion may be attributed to various factors such as low autonomy and decision-making power for females about their reproductive rights, low literacy rates among females, poverty, political instability, high fertility rates, and environmental crises along with other development challenges facing the country [19]. The only country with a close value is Chad which had 67% of married women aged 20–24 who were married off before the age of 18. This relatively high rate is contributed by the rampant practice of giving out the young in marriage to reduce the parental cost of raising them; this further increases the fertility rate of the country (25).
Ghana recorded a relatively lower proportion of child brides as 21% of married women between ages 20–24 got married before age 18. According to UNFPA-UNICEF [21], this is the lowest prevalence of all the African countries included in the global programme against early marriage. However, there exists a strong disparity between the southern, where there is the low prevalence and northern Ghana, where the prevalence is higher. Also, the International Centre for Research on Women (ICWR) study on child marriage in Ghana revealed that there are two different types of child marriage. Type I Child Marriage is characterized by strong social norms and limitations on the autonomy or freedom of adolescent girls; it is common in the northern and Sahelian regions of the country. Type II Child Marriage is common in the southern coastal part of Ghana where adolescent girls have the freedom to choose and make the decision about their sexual and reproductive rights [19]. Other African countries with a lower prevalence of child marriage are Gabon (22%) and Kenya (23%) proportion. This similarity may be due to the governments’ willingness to partner with the National Action Plan (NAP) of the United Nations International Children Educational Funds (UNICEF) to end child marriage and adolescent pregnancy.
It was reported that 37% of females of 20–24 years were married before age 18 in the Democratic Republic of Congo (DRC). This proportion is higher in rural areas than urban ones [26]. In 2010, women between 20 and 24 years living in rural areas were 1.7 times more likely to get married before 18 than their urban counterparts [26]. Poverty, gender inequality, and harmful cultural practice in the conflict-ridden areas are the possible underlying factors. In some of the rural regions of DRC, there exists a cultural belief that girls should marry at the onset of menstruation as it indicates the start of child-rearing age. The majority of South Asian nations have the prevalence of child marriage in the same range as that of DRC who had about 40% prevalence rate [14]. This can be due to some similarities in cultural and societal beliefs and practices.