[en] Introduction and objectives: there are a few studies in Spain that update the evidence on advanced maternal age as an independent obstetric risk factor. The objective of this study was to determine the prevalence of advanced maternal age (≥35 age) in pregnant women who give birth in a Hospital from Northwestern Spain, and its association with the incidence of maternal-perinatal morbidity, in terms of complications during pregnancy, childbirth and perinatal outcomes. Material and Methods: Retrospective follow-up observational study that included women ≥ 20 years-old who gave birth during 2014 (n=1378). The temporal evolution of maternal age on the day of delivery of pregnant women who gave birth in that hospital in the period 2011-2021 was also analysed. Data were collected from medical records, including socio-demographic characteristics, comorbidities, gestational conditions, and variables related with the delivery and perinatal outcomes. The evolution of the prevalence of advanced maternal age was studied using a joinpoint regression analysis. Multivariable logistic regression analysis was performed to determine the association of advanced maternal age with obstetric and perinatal outcomes. Results: In the lasts years, there has been a progressive and significative increase of pregnant women age 35 or over, going from 35,4% of deliveries attended in 2011 to 45,5% in 20221 (average annual increase 2,1%; 95% IC=1,0%-2,7%). After adjusting for potential confounding factors in the multivariate analysis, advanced maternal age was associated with the likelihood of gestational diabetes (OR=1.84; 95% CI=1,10-3,07), hypothyroidism (OR=2,11; 95% CI=1,17-3,80), lower probability of an eutocic delivery (OR= 0,74; 95% CI=0,56-0,98) and an increased risk of requiring hospital admission ≥4 days (OR=2,91; 95% CI=1,95-4,35). No association was found with C-section's rate (OR=1,24; 95% CI=0,89-1,72) or with the rest of complications. Conclusions: A high prevalence of pregnant women of advanced maternal age was confirmed which continues to increase. These pregnant women have a significantly higher risk of developing diabetes and gestational hypothyroidism, as well as requiring a longer hospital stay. It is also associated with a lower probability of eutocic deliveries. However, it is not associated with a higher rate of c-sections or with the rest of the complications studied.

[gl] Introdución e obxectivos: son escasos os estudos en España que actualicen a evidencia sobre a idade materna avanzada como un factor de risco obstétrico. O obxectivo foi determinala prevaleza da idade materna avanzada (≥35 años) en xestantes que dan a luz nun hospital do noroeste de España, e a súas asociacións coa incidencia de morbimortalidade materno-perinatal, en canto as complicación durante a xestación, o parto e os resultados perinatais. Material e métodos: Estudo observacional de seguimento retrospectivo que incluíu a mulleres ≥20 anos que deron a luz durante 2014 (n=1378). Analizouse ademais a evolución temporal das idades maternas no día do parto das xestantes que deron a luz en dito hospital no período 2011-2021. Os datos recolléronse das historias clínicas, incluíndo as características sociodemográficas, comorbilidade, patoloxía xestacional e variables relacionadas co parto e os resultados perinatais. A evolución na prevaleza da idade materna avanzada estudouse mediante unha análise de regresión joinpoint. Realizouse unha análise de regresión loxística multivariante para determinala asociación da idade avanzada cos resultados obstétricos e perinatais. Resultados: nos últimos anos, rexistrouse un aumento progresivo e significativo da prevaleza de xestantes con 35 anos ou máis, pasando dun 35,4% des partos atendidos no 2011 o 45,5% do ano 2021 (incremento medio anual 2,1%; 95% IC=1,0%-2,7%). Tras axustar por potenciais factores de confusión na análise multivariable, a idade materna avanzada asociouse con unha maior probabilidades de diabetes xestacional (OR=1,84; 95% IC=1,10-3,07), hipotiroidismo (OR=2,11; 95% IC=1,17-3,80), menor probabilidade de un parto eutócico (OR=0,74; 95% IC=0,56-0,98) e un maior risco de precisar ingreso hospitalario >4 días (OR=2,91; 95% IC=1,95-4,35). Non se atopou unha asociación coa taxa de cesáreas (OR=1,24; 95% IC=0.89-1,72) ni co resto de complicacións analizadas. Conclusións: Confírmase a alta prevaleza de xestantes maiores. Estas xestantes presentan un risco significativamente maior de presentar diabetes e hipotiroidismo xestacional, así como de precisar un ingreso hospitalario máis longo. Tamén se asocia a unha menor probabilidade de partos eutócicos. Sen embargo, non se asocia a unha maior taxa se cesáreas nin o resto de complicación estudadas.