Comparison of cervical length in adult and adolescent nulliparae at mid-gestation.

STUDY

OBJECTIVE

To compare cervical lengths of adolescents and adults in mid-gestation.

DESIGN

An analytical, observational, and cross-sectional study.

SETTING

Public health system in the city of Blumenau, Brazil.

PARTICIPANTS

Primigravidae adolescents under the age of 16 and adults over age 20 (n = 40/group) were systematically sampled.

INTERVENTIONS: Cervical measurements were performed between 21 and 24 weeks of gestation through transvaginal ultrasonography using a previously validated method.

MAIN OUTCOME MEASURES: Mean cervical length (Mann-Whitney test) and percentage of cervices below 25 mm (Fisher exact test).

RESULTS

For adolescents and adults, average uterine cervix lengths were 28 ± 6.6 mm 33 ± 4.1 mm (P < .0001), respectively, and the proportion of cervixes below 25 mm were 27.5% and 7.5% (P < .02), respectively. In addition, adolescents had significantly lower gynecologic age, education, and family income than adults.

CONCLUSION

Primigravida adolescents under the age of 16 have shorter cervices than adults, and a higher percentage of adolescents have cervices shorter than 25 mm. This may be associated with the higher risk of preterm birth observed in adolescents and suggests that this population requires special attention in prenatal care.