Adolescents are defined as young people from the age of 10–19 years, which can be divided into early (10–14 years) and late (15–19 years). Only the late adolescents are a composite part of women of child bearing age (WCBA) (15–49 years), for whom maternal health services provisions including family planning are made available in most countries. In 2015, the United Nations Development Programme (UNDP) noted that countries will need to meet the increasing demand for contraceptives by the world’s population of 15- to 19-year-olds, of which there are more than 600 million ¹ . The inability to meet this need will perpetuate negative health consequences of early, unprotected sex by adolescents such as unintended pregnancy, unsafe abortions, pregnancy-related mortality/morbidity and sexually transmitted infections (STIs) including Human Immunodeficiency Virus (HIV), as well as their social and economic costs ² . This is further buttressed by the fact that annually, an average of three million unsafe abortions occur worldwide among female adolescents aged 15–19 years ³ .

The 2013 Nigeria Demographic and Health Survey (NDHS) reported that 15.6% of adolescent girls first had sexual intercourse by the age of 15 years and 28.2% of women in this age range are in union (currently married or living together with a man as if married) ⁴ . Although 13% of those in union wanted to space their pregnancies, only 2.1% were using any pregnancy prevention method at the time ⁴ . The majority of births to adolescent mothers in developing countries occur within marital life ⁵ .

Around 15% (range 6%–67%) of adolescent girls in developing countries aged 15–19 who are married or in a relationship are using modern contraceptive methods ^{2, 6} . This is lower than the rate amongst all WCBA. The NDHS reported an increase in modern contraceptive prevalence rate (mCPR) from 9.7% to 9.8% among married WCBA between 2008 and 2013, while amongst adolescents aged 15–19 years it reduced from 2.4% to 1.2% in the same five-year period ^{4, 7} .

Expanding options and choices for the poorest women and adolescent girls is the most important thing to do, as stated by Dr Natalia Kanem, UNFPA Executive Director ⁸ . WHO has recommended that women from menarche through to 40 years of age can use oral combined hormonal contraceptives (CHCs) without restriction, while young women (menarche to < 18 years) can generally use DMPA injections ⁹ . Sexually active adolescents who are unmarried have very different needs from those who are married and want to postpone, space or limit pregnancy ⁹ . The choice of method may also be influenced by factors such as sporadic patterns of intercourse and the need to conceal sexual activity and contraceptive use ⁹ . Other key social and behavioral considerations for adolescents choosing a contraceptive method include the risk of STIs, including HIV, and the preference to use methods that do not require a daily regimen for convenience ⁹ . Nevertheless, adolescents, married or unmarried, have also been shown to be less tolerant of side-effects and therefore have high discontinuation rates ⁹ .

Adolescents are eligible to both access and use of all the same methods of contraception as adults ⁹ . IUDs account for close to half of family planning methods used in Eastern Europe and Central Asia ¹⁰ , while three methods alone account for 73% of the mCPR in Latin America and the Caribbean; female sterilization (37%), the pill (22%) and male condoms (13%). The contraceptive methods of preference in the Arab States are the pill and IUD, which together account for 85% of the mCPR ¹⁰ . A study from Brazil indicated that male condoms are the method most commonly used by adolescents, given that they are readily accessible and inexpensive ² . Other reports from developing countries showed that the pill and the injection accounts for more than 70% of their total use of modern methods, followed by male condoms (21%) and IUDs (5%) ⁶ .

Studies have shown that sexually active unmarried adolescents do not seek to become pregnant, while the majority of their married peers do not wish to become pregnant at an early age or, in cases where they already have a child, prefer to delay the next pregnancy ¹¹ . Unfortunately, unmet need for contraception is common among sexually active adolescents ² . These are group of adolescents who want to stop or delay childbearing but are not using any method of contraception. This varies by age, sex, region and marital status ² . More than a third of adolescent girls with this unmet need in developing countries live in sub-Saharan Africa ⁵ . The current unmet need for contraception for married adolescents aged 15–19 in 14 developing countries ranged from 7%–62% ² .

One major outcome of an unmet need for family planning is unwanted pregnancy, which contributes to high levels of unsafe abortion and deaths among girls aged 15–19 years in LMICs ¹² . Therefore, improved access and utilization of contraceptives is key to preventing these problems ² .

Most adolescents have poor access to contraceptive information and services, especially long acting hormonal methods and intrauterine devices ⁹ . This is a result of restrictive laws and policies, fear of confidentiality, judgmental health workers ⁹ and the belief that some contraceptive methods are inappropriate for nulliparous women ² .

Several studies have proposed strategies to remove barriers to contraceptive services in order to urgently meet the contraceptive needs of adolescents ⁹ . These include proper education and counselling before and at the time of method selection, expanding method choices, reducing costs of services ⁹ and improving communication and information through the mass media ² . Importantly, adolescents must be provided accurate information and given opportunities to ask questions and discuss their concerns. These strategies should be reinforced through peer-education, inter-personal communication and information, education communication materials (such as posters and leaflets) to influence their social norms ² . Service providers should be trained and encouraged to avoid denying them of their right to receive comprehensive and confidential information on pregnancy prevention with abstinence, delay in sexual initiation and contraceptive counselling and services, in order to make informed decisions on contraceptive choices.

As of 2015, Kaduna State has an estimated projected population of 8,103,075, of which 1,620,615 (20%) were WCBA (15–49 years) and 745,483 (9.2%) were female adolescents ¹³ . Additionally, there were 162,095 couples targeted for Family Planning (FP) services in the public health sector, which constitutes 2% of the total population. Among WCBA in the state, 5.8% had an unmet need for FP services ⁴ and the value is higher among married adolescents in Nigeria, at 13.1% ⁴ .

The State has three public FP referral clinics within the Kaduna metropolis, located in Kawo General Hospital (KGH), Yusuf Dantsoho General Hospital (YDGH) and Sabon Tasha General Hospital (STGH). These clinics provide the bulk of Long Acting Reversible Contraceptives (LARCs) due to the availability of skilled manpower. Nevertheless, 33.3% of women aged 20–24 were reported to have had a live birth before the age of 18 ⁴ . Therefore, for Kaduna State to attain the target mCPR of 45.6% by 2018, its FP services must reach all WCBA, especially adolescents, as captured in the Nigerian FP2020 blue print ⁶ . This study aimed to evaluate the use of FP services by adolescents in the referral health facilities of Kaduna metropolis. The objectives were to collect the data in the FP registers; disaggregate the data by age, parity and types of contraceptives used by adolescents; and estimate the contraceptive method mix index for adolescent clients. Together, these were considered to establish whether adolescents can adequately access the available FP services in these referral centers.

The three health facilities all together has a catchment population of 192,554, of which 22% (42,361) were WCBA ¹⁷ . The study population are the 7,837 WCBA using contraceptives during the period of 2014 to 2016, estimated from the mCPR of 18.5% for Kaduna State ⁴ . The estimated minimum sample size using the Slovin’s formula ¹⁵ was 1023, as shown in Table 1.

A total of 5750 registered all-female FP client were sampled for the three-year study period of which 5543 (96.4%) had complete client registration numbers. These 5543 also had complete data on months of clinic attendance and types of contraceptives used. The percentages of missing data for other parameters varied as follows; age (0.05%), gravidity (80.5%) and parity (59.6%).

There were a total of 200 adolescents, which constitutes 3.6% of the total client population ¹⁶ . The annual proportion of adolescent contraceptive users ranged from 3.1–4.1%, with an average of 3.6%. The absolute number of adolescent clients had increased by 80% over the three-year period.

The total client ages ranged from 12 – 57 years with an average of 27 years. The majority (85%) of the adolescents were between the ages of 18–19 years.

Data on 80.5% and 59.6% of client gravidity and parity, respectively, were missing in the FP registers. Only 1079 clients in GHK and STGH had their gravidity recorded in the FP registers. The gravidity for all clients ranged from 0–14, with an average of four for all clients. The average gravidity for adolescent client was two.

The parity status of the 2328 clients recorded in the YDGH family planning register for 2014 to 2016 was not indicated. Most (96.7%) of the FP clients with available data on parity (2238 clients in GHK and STGH) have had a live birth with an average parity of four. The parity among the adolescent ranged between one and four, with an average of two. Only 3.3% of the adolescent clients had never had a child ( Figure 1).

As indicated in Figure 2, the commonest contraceptive used by all the clients were injectables (56.5%) and implants (29.3%). The commonest contraceptives used by the adolescents were injectables (62.8%), implants (23.1%) and pills (11.6%). Only 2.5% of the adolescents used the condoms while none of them used either the IUD, sterilization or natural methods.

The overall method mix index for all clients was 47.7%, while the method mix for adolescents was 51.0%, indicating a middle method mix index (i.e. no dominance of one method) for both age groups. Nevertheless, adolescents’ users still demonstrate slightly higher but not significant dominance of one modern contraceptive method (i.e. injectables).

The study reported a low proportion of adolescents (< 4.5%) amongst women that utilized modern contraceptives and the limited FP methods chosen by adolescents in all the three secondary health facilities located within Kaduna metropolis during the study period. This is less than half of the known proportion of adolescents in the state, which is 9.2% ¹³ . This is low, especially in a country where 13.1% of married adolescents have an unmet need for contraception ⁴ . This is due to the age-long bias (i.e. wrong beliefs, restrictive laws and policies, judgmental health workers, and societal pressure) to and limited choice for family planning and other sexual reproductive health services and information for adolescents ^{2, 6, 9, 12} . This finding further strengthens the need for ongoing reprogramming strategies aimed at the provision of more adolescent-friendly family planning services and information ⁹ .

Although there was an 80% increase in the absolute number of adolescent contraceptive users between 2014 and 2016, the reported annual proportion of adolescent contraceptive users fluctuates between 3.1 – 4.1% of all users, with an average of 3.6% ( Table 2). These results further confirmed the reported low utilization of FP services in northern Nigeria, especially amongst adolescents, and the associated high unmet need for contraception among married adolescents ⁴ . This may be due to an existing preference for a large family and misconceptions about family planning services. Additionally, other challenges still exist within the community, the family, service providers and among adolescents relating to the access and utilization of FP services, ranging from sociocultural and health concerns to financial limitations ^{3, 9, 12} . Therefore, despite the slight national increase in the reported mCPR from 9.7 to 9.8% among married WCBA between 2008 and 2013, the reverse (reduced mCPR from 2.4 to 1.2%) was the case among adolescents aged 15–19 years in the same period ^{4, 7} .

As shown in Table 3, the age range of the 5543 contraceptive users reviewed were from 12 to 57 years old, of which only 200 (3.6%) were adolescents. This proportion was expected to be much higher, considering the fact that adolescent girls constitute around 22.8% of the female population in Nigeria ¹¹ . Additionally, 85% of the adolescents were between 18 and 19 years of age, thus excluding the majority of early adolescents in a place where 15.6% of adolescent girls had their first sexual intercourse at age 15 ⁴ . This may be because societal pressure prohibiting the use of contraceptive methods, especially by adolescents, still exists ¹² , which is enabled by associated factors including the age difference between partners for adolescent girls that marry older men ⁶ , social isolation, limited mobility and pressures to prove fertility by becoming pregnant early and often ² . Thus, contraception is often considered only after a first child is born ² . This contraceptive use is inappropriate in a place where 33.3% of women aged 20–24 years have had a live birth before the age of 18 years ⁴ and where 13% of those currently in union want to space their pregnancy, but only 2.1% are using any pregnancy prevention method ⁴ .

Figure 1 shows that greater than 96% of the adolescent family planning users had given birth to at least one child. These are reports from only two (KGH and STGH) of the three health facilities because the family planning register in the third health facility (YDGH) has no record of client parity. Nevertheless, this is much higher than the value of 33.3% reported from the 2013 population survey for the state ⁴ . It should be noted that the present data source is facility based, which is likely to exclude unmarried adolescents that may not like to expose their private sexual reproductive health practices, especially to the not too friendly and sometimes judgmental health workers. The prevailing culture which expects married adolescents to commence childbearing immediately after marriage in order to demonstrate their fertility also accounts for this. Contraception is often only considered after a first child is born ³ . Furthermore, in Nigeria, family planning clinics are mostly attended by married women, excluding a significant population of sexually active unmarried adolescents that may be using some methods of FP ¹⁸ .

More than half (62.8%) of the adolescent clients used injectable contraceptives, as shown in Figure 2. None of them used the IUD, sterilization or natural family planning methods. This is similar to reports from other developing countries, which showed that the pill and the injection accounts for more than 70% of their total use of modern methods, followed by male condoms (21%) and IUDs (5%) ⁵ . Although adolescents are eligible to both access and use of all the same methods of contraception as adults ⁹ , limitations still exist due to provider bias, inadequate information, restrictive laws and policies, fear of confidentiality ⁹ and the belief that some contraceptive methods are inappropriate for nulliparous women ³ . More obviously, adolescents have poor access to information and services for long-acting hormonal methods and intrauterine devices, mainly emanating from provider bias during client counselling and the cost of such methods ⁹ .

This study is primarily limited by being a desk review of client data that were not purposely collected for the study. There is the possibility of some clients not having been registered after service, missing pages or missing registers. Bias, such as double counting, may occur from horizontal referral among the participating facilities and client revisits to the same facility. The data available were also not disaggregated by important parameters such as the marital status or extent of sexual activity engaged in by the clients.

The low proportion of adolescent contraceptive users and the limited choice of contraceptive methods made by them indicate an urgent need to implement programs that will improve their contraceptive utilization, remove barriers to services and improve service coverage. These include the provision of adolescent friendly services, peer-education, as well as age-customized inter-personal communication and effective client-centered counselling before and at the time of method selection, in order to help adolescents, address their particular needs and help them make informed and voluntary decisions.

This finding brings forth the ineffectiveness of previous policies and programs on adolescent contraceptive needs. It elucidates the unmet need and inadequate contraceptive methods mix for married adolescents and highlights the need for a more in-depth study to unravel the root cause of the non-utilization of a wider range of methods, including the IUD, by adolescents.