We conducted a cross-sectional descriptive study with retrospective data collection from 1 January to 31 December 2023 in 8 health facilities of the city of Garoua, northern Cameroon: the Regional Hospital of Garoua (HRG), the two Medical Centres (CMA) of Laïndé and Djamboutou, as well as 5 Integrated Health Centres (Kolléré, Ngalbidjé, Poumpoumré, Bocklé, and Takasko). These facilities serve the two health districts, which significantly cover the urban and peri-urban population. The selected facilities are public health institutions providing intrapartum care at relatively low cost, thereby ensuring greater accessibility for the population. They were also chosen because they serve as the main centers within the two main health districts of Garoua and manage a higher patient load compared to other facilities.

All parturients aged 10 - 19 years who delivered at one of the study facilities during the study period were eligible. Patients were excluded if their delivery occurred outside the study period or if their medical records were incomplete. Using consecutive non-probability sampling, 993 adolescent deliveries were identified, of which 604 complete files were retained after exclusion of 389 records. The 389 excluded records were most commonly missing blood pressure values at admission, delivery outcome data, or gestational age; as severely complicated cases may have required emergency transfer with incomplete documentation, the excluded files may be skewed towards more severe presentations, potentially leading to an underestimate of complication rates in the analyzed data.

The main variables studied were: sociodemographic data (age, education level, marital status, occupation); obstetric history (parity, gestational age, previous complications); antenatal care attendance (number of ANC visits, ultrasound examinations, blood tests); clinical examination at admission (conjunctival colour, blood pressure, neurological signs, vaginal bleeding); obstetric examination (foetal heart rate, state of membranes, amniotic fluid colour, foetal presentation); and maternal outcomes (complications, maternal death and its cause). Key outcomes were defined as follows using chart-recorded values: hypertension as systolic blood pressure ≥ 140 mmHg or diastolic blood pressure ≥ 90 mmHg on admission; anaemia as pallor of conjunctivae on clinical examination (categorised as normal, moderately pale, or pale as recorded in the partogram); neurological signs as any of headache, visual disturbances, or hyperreflexia recorded at admission; pre-eclampsia as hypertension in pregnancy plus at least one additional feature (oedema, proteinuria, or neurological signs) as documented by the attending physician; eclampsia as generalised tonic-clonic convulsions in a woman with pre-eclampsia; and postpartum haemorrhage as excessive bleeding in the immediate postpartum period as recorded by the physician.

Data were collected retrospectively from obstetric records and delivery registers and entered and analysed using EPI INFO version 3.5.3. Results are expressed as frequencies and percentages. The study was conducted in accordance with the principles of the Declaration of Helsinki [13] and was approved by the Regional Committee for Health Research Ethics of the North Region (Ref. N˚0011/CERSH/NO/2024). Patient confidentiality was maintained throughout.

Of the 3031 deliveries recorded during 2023, 993 involved adolescents, giving an adolescent delivery rate of 32.76% (i.e., 993 of 3031 total deliveries involved a mother aged 10 - 19 years). After exclusion of 389 incomplete records, 604 files were analysed. The mean age was 17.73 ± 1.21 years (range: 12 - 19 years). The 18 - 19 age group accounted for 58.94% of cases. The vast majority of adolescents (86.42%) were married (n = 522 of 602 with complete marital status data; 2 records missing). Education was limited: 33.77% had never attended school and 42.72% had only primary education. Most (72.19%) were housewives (Table 1).

Table 1. Distribution by age, education, marital status and occupation.

The majority of adolescents (74.34%) were primigravida. Only 10.76% had ever used a modern contraceptive method. The mean age at menarche was 11 years in 50.33% of cases. Previous obstetric events of note included uterine scar (1.99%), previous gestational hypertension (0.17%), and previous eclampsia (0.17%).

ANC attendance was inadequate in the majority of cases. Only 17.22% had achieved the minimum recommended 4 ANC visits; 73.84% attended only 1 - 3 times, and 8.94% received no antenatal care whatsoever. Over 11% had no ultrasound examination during pregnancy. Despite low ANC uptake, 91.56% had received iron supplementation and 90.23% had received intermittent preventive treatment for malaria (Table 2).

Table 2. Antenatal care attendance and treatments received.

Hypertension was present in 6.29% of adolescents at admission. Neurological signs (headache, visual disturbances, hyperreflexia) suggesting imminent eclampsia were found in 3.31%. Active vaginal bleeding was noted in 3.48%, and signs of anaemia in 6.46%. Among patients with ruptured membranes (n = 407), meconium-stained amniotic fluid was observed in 25.55% of cases (Table 3).

Table 3. Clinical signs of complications at admission.

Maternal deaths occurred in 20 cases, representing a rate of 3.31%. Eclampsia was the leading cause of death (50%), followed by postpartum hemorrhage (30%), hypertension (10%), severe pre-eclampsia (5%), and uterine rupture (5%) (Table 4).

Table 4. Distribution by cause of maternal death.

The adolescent delivery rate of 32.76% in our series is markedly higher than that reported by Samaké et al. in 2022 in Bamako (19.61%) [14], Adama-Hondegla et al. in Lomé (3.66%) [15], and Fouelifack et al. at Yaoundé Central Hospital (9.3%) [16]. This high rate likely reflects the specific socio-cultural context of northern Cameroon, where early marriage is prevalent [9][10], as evidenced by 86.42% of adolescents being married, 76.49% having no schooling or only primary education, and only 10.76% using modern contraception—contextual factors frequently co-occurring with adolescent pregnancy in this setting [17].

The low attendance of antenatal care was alarming: only 17.22% achieved the WHO-recommended minimum of 4 visits. The WHO emphasises that via antenatal care we are able to detect and manage hypertensive disorders of pregnancy and anaemia [1]. The rarity of ultrasound examinations (11.42% had none) further compromised the quality of foetal monitoring. Financial barriers, geographic distance, and social factors are the primary explanations for low ANC uptake in this context.

Hypertensive disorders were present at admission in 6.29% of cases, and neurological signs in 3.31%. Eclampsia accounted for 50% of maternal deaths, reflecting both the high prevalence of hypertensive disorders among young primgravidae and delays in diagnosis and treatment [11][12]. The WHO recommends systematic screening for pre-eclampsia at every ANC visit, and early magnesium sulfate administration to prevent progression to eclampsia [1][18].

A proportion of 6.46% of adolescents had signs of anemia at admission despite 91.56% having received iron supplementation. The persistence of anemia may reflect poor nutritional status, malaria, and hemoglobin disorders common in northern Cameroon. Anemia during pregnancy is a significant independent predictor of perinatal asphyxia and neonatal mortality in sub-Saharan Africa [19][20].

Meconium-stained amniotic fluid, a recognized marker of acute fetal distress [19], was present in 25.55% of cases with ruptured membranes. This high rate is consistent with the elevated prevalence of gestational hypertension compromising placental perfusion, and with insufficient fetal surveillance during labor. This finding is further explored in our companion paper on delivery outcomes.

The maternal death rate of 3.31% in our cohort is high in the context of African adolescent obstetric series. In a systematic review and meta-analysis of adolescent deliveries in Cameroon, Njim et al. confirmed that adolescents face a significantly increased burden of adverse maternal and neonatal outcomes compared with adults [21]. Similarly, in a comparative hospital study at the Korle-Bu Teaching Hospital in Accra, Ghana, Onuzo et al. found that adolescents had approximately three-fold higher odds of eclampsia than adults [22]. Sub-Saharan Africa accounts for approximately 70% of global maternal deaths, with 182,000 deaths in 2023 [23]. Among adolescents, risk is amplified by physiological immaturity, late presentation, and delayed management [2][6]. Eclampsia, responsible for 50% of deaths in this series, is preventable with timely pre-eclampsia screening and magnesium sulphate prophylaxis [18].

The study had many limitations that have to be integrated when analysing the findings. First, the retrospective design and reliance on routine obstetric records mean that data quality depends on the completeness and accuracy of clinical documentation, which may be challenging in resource-limited settings and more difficult in a health centre. Second, the exclusion of 389 (39%) eligible records due to incompleteness introduces a potential selection bias; if more severely ill patients were more likely to have incomplete records (e.g., due to emergency transfers), complication rates in the analysed adolescents may be underestimated. Thirdly, because the study was not carried out in all the facilities, it restricts the generalization of the results obtained. The health-facility deliveries represent a self-selected population, and the findings cannot be extrapolated to home births or the wider adolescent population of northern Cameroon.