Background: Adolescent pregnancy is a serious health and social problem worldwide as well as in Cameroon. The aim of this study was to determine the obstetrical and perinatal outcomes of nulliparous adolescent pregnancies in a reference hospital in Cameroon. Methods: A retrospective cohort study to compare the outcomes of nulliparous adolescent pregnancies to those of nulliparous women aged 20 to 25 years was carried out at the Yaoundé General Hospital between January 1993 and December 2012. Results: Adolescent deliveries represented 2.84% (331 deliveries) of all deliveries registered during the study period. The adolescent mothers had a significantly higher incidence of preeclampsia/eclampsia, preterm delivery and low birth weight babies (<2500 g) when compared to the control group (OR, 3.46; CI 95%, 1.46 - 8.18; OR, 1.94 CI 95%, 1.34 - 2.79; OR, 1.98, CI 95%, 1.39 - 2.46, respectively). However, placenta previa, abruptio placenta, episiotomy, cesarean section, vaginal instrumental delivery, perineal tears and post partum hemorrhage were not significantly different in the two groups. Furthermore, there was no statistically significant difference between the two groups regarding fetal distress, low Apgar score (<7 at the 1st and 5th minutes), the rate of admission in the neonatal intensive care unit, stillbirth and neonatal death. Conclusion: Adolescent pregnancy is associated with an increased risk of preeclampsia/ eclampsia, preterm birth and low birth weight.
Adolescent pregnancy is defined by the World Health Organization as a pregnancy occurring in girls aged 10 - 19 years [
In Cameroon, a recent study carried out to assess adolescents’ contribution to deliveries in referral maternities reported that adolescents overall contributed to 14.23% of deliveries [
The social consequences of adolescent pregnancy include school dropout and in some settings, violence, including suicide and homicide [
Most studies from developed and developing countries have reported among pregnant adolescents higher risks of inadequate prenatal care [
The aim of this study was to determine the obstetrical and perinatal outcomes of nulliparous adolescent pregnancies at the Yaoundé General Hospital (YGH).
This was a retrospective cohort study carried out at the Yaoundé General Hospital (YGH), a tertiary teaching hospital in Yaoundé, which is an urban setting in Cameroon, Central Africa. At the YGH, normal deliveries are carried out by residents and midwives under the supervision of obstetricians. Furthermore, vaginal instrumental deliveries and cesarean deliveries are done by obstetricians assisted by residents. Birth records are filled by the midwives.
All nulliparous women aged 19 years or less who put to birth in this hospital between January 1993 and December 2012 were consecutively recruited in this study as the study group. Alongside, the nulliparous women aged 20 - 25 years were grouped as the control group. Excluded from the study were all the women whose pregnancies failed to reach 28 weeks and those who had a previous pregnancy that reached 28 weeks and beyond. The sample size was calculated using the Epi Info software at a power of 80% and a 95% level of confidence. From previous studies, the mean prevalence of adverse maternal outcome was estimated at 24.9% [
Data used in the analysis was obtained from available hospital records (delivery registers, medical files). The data included the socio-demographic, obstetrical and perinatal characteristics of the two groups. Gestational age was estimated from the first date of the last menstrual period, since the ultrasound dating of pregnancy was not usually done in our setting. The maternal variables studied were HIV status, preeclampsia/eclampsia, antenatal hemorrhage (placenta previa, abruptio placenta), cesarean delivery, instrumental vaginal delivery, perineal tear, episiotomy and post-partum hemorrhage (defined as an estimated blood loss >500 mL following a vaginal birth or >1000 mL following a cesarean section).
The perinatal outcomes studied were prematurity (live birth before 37 weeks of gestation), low birth weight (<2500 g), very low birth weight (<1500 g), low Apgar score (<7 at the 5th minute), admission to the neonatal intensive care unit, intra uterine fetal death, fetal distress (defined as persistent or recurrent abnormal fetal heart rate) and early neonatal mortality (death during the first week of life).
The data collected was analyzed using the 2009 SPSS version 18.0.0 (2000 SPSS Inc., IL, USA).
Categorical variables were compared by Chi-square test. The level of significance was defined as p < 0.05 or by a 95% confidence interval that did not include 1.
During the study period, there were 11,640 deliveries at the Yaoundé General Hospital. Of these, 331 (2.84%) deliveries were from adolescents aged 19 years and less and 11,309 (97.15%) were from women aged 20 years and above. Of the deliveries from adolescent mothers, 285 (86.10%) were primiparous and 40 (13.89%) were multiparous.
Variables | Maternal age | ||
---|---|---|---|
<20 years | 20 - 25 years | ||
% (n = 285) | % (n = 1394) | p | |
Maternal age (Mean ± SD) | 17.76 y ± 1.30 | 22.86 y ± 1.64 | - |
Gestational age at birth (Mean ± SD) | 38.19 w ± 3.05 | 38.62 w ± 2.37 | 0.040 |
Marital status | |||
Married | 23.50 (67) | 66.42 (926) | 0.000 |
Single | 76.49 (218) | 33.57 (468) | |
No. of antenatal visits ≥ 4 | 71.92 (205) | 72.38 (1009) | 0.862 |
HIV infection | 0.70 (2) | 0.8 (11) | 0.878 |
Multiple pregnancies | 3.16 (9) | 2.8 (39) | 0.740 |
Abnormal presentation | 4.21 (12) | 3.51 (49) | 0.580 |
Cephalic presentation | 93.68 (267) | 93.47 (1303) | - |
y: years; w: weeks.
Variables | Maternal age | |||
---|---|---|---|---|
<20 years | 20 - 25 years | |||
% (n = 285) | % (n = 1394) | Odds ratio [CI 95%] | p | |
Preeclampsia/eclampsia | 3.15 (9) | 0.93 (13) | 3.46 [1.46 - 8.18] | 0.006 |
Placenta previa | 0.35 (1) | 0.14 (2) | 2.45 [0.04 - 47.18] | 0.428 |
Abruptio placenta | 0.35 (1) | 0.14 (2) | 2.45 [0.04 - 47.18] | 0.428 |
Cesarean sections | 13.68 (39) | 12.98 (181) | 1.07 [0.73 - 1.55] | 0.717 |
Induction of labor | 7.71 (22) | 15.06 (210) | 0.47 [0.29 - 0.77] | 0.001 |
Vaginal instrumental delivery | 2.45 (7) | 2.94 (41) | 0.77 [0.31 - 1.82] | 0.53 |
Perineal tear | 20.35 (58) | 22.38 (312) | 0,82 [0.61 - 1.23] | 0.41 |
Episiotomy | 19.29 (55) | 18.00 (251) | 1.07 [0.74 - 1.53] | 0.715 |
Post partum hemorrhage | 0.35 (1) | 0.64 (9) | 0.54 [0.01 - 3.93] | 1.000 |
The adolescent mothers had a significantly higher incidence of preeclampsia/eclampsia when compared to women aged 20 to 25 years (OR, 3.46; CI 95%, 1.46 - 8.18). However, placenta previa, abruptio placenta, episiotomy, cesarean section, vaginal instrumental delivery, perineal tears and post partum hemorrhage were not significantly different in the two groups. On the other hand, induction of labor was significantly less frequent in the adolescent mothers (OR, 0.47 CI 95%, 0.29 - 0.77). There were no maternal deaths in both groups during the study’s period.
Pregnancy at an early age is regrettably common in many low-income countries, and yet the debate about the degree of risk associated with it is still open. Overall, in this large retrospective cohort study carried out at a tertiary hospital in Cameroon, we found that the adolescent mothers had a higher risk of preeclampsia/eclampsia, preterm birth and low birth weight when compared to mothers aged 20 - 25 years.
Several studies have highlighted the importance of antenatal care in reducing the risks of adverse outcome during pregnancy [
The lesser adverse maternal and neonatal outcomes found among adolescents in this study may be due mainly to adequate prenatal care. The majority of pregnant adolescents (71.92%) and women aged 20 - 25 years (72.38%) made at least four prenatal visits. Furthermore, the Yaoundé General Hospital is a reference hospital where antenatal services, delivery and postpartum care are provided by obstetricians, residents and midwives.
As seen with previous studies [
Variables | Maternal age | |||
---|---|---|---|---|
<20 years | 20 - 25 years | |||
% (n = 285) | % (n = 1394) | Odds ratio (CI 95%) | p | |
Preterm birth (<37 weeks) | 17.89 (51) | 10.25 (143) | 1.94 [1.34 - 2.79] | 0.000 |
Prolonged pregnancy (>41 weeks) | 3.15 (09) | 2.72 (38) | 1.18 [0.56 - 2.46] | 0.659 |
Birth weight (Mean ± SD) | 2967.82 g ± 622 | 3086 g ± 542 | -- | 0.04 |
Low birth weight < 2500 g | 17.89 (51) | 9.89 (138) | 1.98 [1.39 - 2.81] | 0.001 |
Very low birth weight < 1500 g | 2.10 (6) | 1.50 (21) | 1.46 [0.52 - 3.85] | 0.419 |
Fetal distress | 2.10 (6) | 2.36 (33) | 0.89 [0.33 - 2.24] | 0.789 |
Low Apgar score (<7 at 1st min) | 12.28 (35) | 13.62 (190) | 0.88 [0.59 - 1.32] | 0.530 |
Low Apgar score (<7 at 5th min) | 1.05 (03) | 2.00 (28) | 0.57 [0.13 - 2.03] | 0.450 |
Admission to NICU* | 16.14 (46) | 16.42 (229) | 0.98 [0.68 - 1.40] | 0.899 |
Intrauterine fetal death | 1.05 (3) | 0.71 (10) | 1.47 [0.26 - 5.76] | 0.472 |
Neonatal death | 0.70 (2) | 0.14 (2) | 4.92 [0.49 - 48.88] | 0.136 |
g: grams; *NICU: neonatal intensive care unit.
Psychological instability of young mothers, which has been reported to increase the risk of preterm labor, may be an additional factor [
The etiology of preterm birth is multifactorial and includes socioeconomic conditions, maternal malnutrition, iron deficiency anemia, vaginal and urinary tract infections, young maternal age at first delivery and hypertensive disorders during pregnancy [
The exact causes of preeclampsia are not known. Preeclampsia is most often seen in first-time pregnancies, in pregnant teens, and in women over 40. The high incidence of pre-eclampsia/eclampsia among pregnant adolescents ties with the findings of other studies [
We found that the rate of induction of labour was significantly lower in adolescent mothers compared to mothers aged 20 - 25 years. The possible explanations could be a more functional myometrium, greater connective tissue elasticity, a lower cervical compliance and low birth weight babies in adolescents that allowed for more spontaneous vaginal deliveries [
Our finding with respect to cesarean section rate is contrary to the widely held belief that biological immaturity of the adolescent pelvis causes cephalopelvic disproportion leading to increased cesarean section rate [
Similar to our findings, other studies did not find any increase in the cesarean section rates among adolescents [
As seen in literature [
This study has some limitations. This was a retrospective study with the risk of bias. YGH is a reference hospital located in an urban area. This limits its accessibility to women with low socioeconomic level thus providing a selection bias.
The results of this study suggest that adolescent pregnancy is associated with an increased risk of preeclampsia/ eclampsia, preterm birth and low birth weight. However, cesarean delivery, instrumental vaginal delivery, stillbirth and early neonatal mortality were not significantly different between adolescents and adult mothers. Adolescents need to be educated about the harmful effects of pregnancy at a young age. Teaching them about contraception and safe sex should reduce the rate of adolescent pregnancy and sexually transmitted infections.