[en] Introduction and objectives: Understanding how temporal and environmental changes influence human health and behavior, particularly in the obstetric field, is relevant given their evident influence and social impact. The objective of this study was to determine the relationship between the chronobiology of the number of births during the period 2011-2016 and specific variables related to pregnancy and birth in the year 2014.Material and methods: A retrospective observational study was conducted, which included 8,622 women whose pregnancies were monitored at Lucus Augusti Hospital in Lugo, who gave birth at the same facility during the period from 2011 to 2016. Additionally, 1,409 women who met the same criteria during the year 2014 were included. The information was obtained through the review of medical records, both in paper and digital formats (IANUS). This study combined descriptive and inferential analysis to examine the recorded data.Results: Of the 8.622 births that occurred during the period 2011-2016 it was observed that the frequency of deliveries is highest on Wednesdays (15.9%). As for the month, the highest percentage of births occurs in May, with 9.0%, and regarding the season, the highest incidence occurs in summer (26.8%), and it is notable that the majority of births occur at night (38.2%). In 2014, of the 1,409 births included in the study, 58.3% began spontaneously, 34.6% were induced, and 7.1% were scheduled cesarean sections. Regarding the method of delivery, 54.2% were eutocic, 19.2% were instrumental, and 26.6% were cesarean sections, of which 25.4% were scheduled. The full moon appears to favorably influence the fastest prepartums (less than 3 hours) at 34.3%, spontaneous ruptures of membranes at 32.0%, and the highest number of births at 27.4%, excluding scheduled cesarean sections. Although the data do not show statistical significance, a trend towards lower birthing activity during weekends is evident. Summer is highlighted as the season with the highest probability of spontaneous conception (26.3%), non-artificial rupture of membranes (27.0%), and a higher number of total births (27.0%) and eutocic births (27.8%). Statistically significant evidence supports that nighttime not only favors the onset (48.5%) and speed of labor (6.3%) but is also associated with the highest volume of unassisted births (41.0%) and spontaneous rupture of membranes (5.4%)Conclusions: Obstetric events triggering labour are significantly favoured during the nocturnal period, influenced by the full moon and the seasonal conditions of summer, although their frequency decreases over the weekends.

[gl] Introdución e obxectivos: Comprender como os cambios temporais e ambientais inflúen na saúde e o comportamento humano, particularmente no ámbito obstétrico é un campo de estudo relevante dada a súa evidenciada influencia e repercusión social. O obxectivo deste estudo foi determinar a relación coa cronobiología do número de partos durante o período 2011-2016 así como con variables específicas relacionadas coa xestación e parto durante o ano 2014. Material e métodos: Realizouse un estudo observacional retrospectivo que incluíu a 8.622 mulleres cuxa xestación foi monitoreada no Hospital Lucus Augusti de Lugo, quen deu a luz no mesmo centro durante o período 2011-2016. Adicionalmente, incluíuse 1.409 mulleres que cumpriron os mesmos criterios durante o ano 2014. A información obtívose mediante a revisión de historias clínicas, tanto en formato papel como dixital (IANUS). Este estudo combinou análises descritivas e inferenciales para analizar os datos rexistrados. Resultados: Dos 8.622 nacementos ocorridos durante o período 2011-2016, observouse que a frecuencia de partos é maior os mércores (15,9%). En canto ao mes, a maior porcentaxe de nacementos ocorre en maio (9,0%) e, respecto a estación, a maior incidencia prodúcese no verán (26,8%). Indicar tamén que a maioría dos partos ocorren durante a noite (38,2%). En 2014, dos 1.409 nacementos incluídos no estudo, o 58,3% comezou de maneira espontánea, o 34,6% foron inducidos e o 7,1% corresponderon a cesáreas programadas. En canto á finalización, o 54,2% foron eutócicos, o 19,2% instrumentais e o 26,6% cesáreas, das cales o 25,4% foron programadas. A lúa chea parece influír favorablemente nos prepartos máis rápidos (menos de 3 horas) cun 34,3%, nas roturas espontáneas de membranas (32,0%) e no maior número de nacementos (27,4%), excluíndo as cesáreas programadas. A pesar de que os datos non mostran significación estatística, evidénciase unha tendencia cara a unha menor actividade de partos durante as fins de semana. O verán destácase como a estación con maior probabilidade de concepción espontánea (26,3%), rotura non artificial de membranas (27,0%) e un número máis alto de partos totais (27,0%) e eutócicos (27,8%). Evidencia estatisticamente significativa apoia que a noite non só favorece o inicio (48,5%) e a rapidez do parto (6,3%), senón que tamén se asocia co maior volume de partos eutócicos (41,0%) e roturas espontáneas de membranas (5,4%). Conclusións: Os eventos obstétricos causantes do parto están significativamente favorecidos polo período nocturno, influenciados pola lúa chea e as condicións estacionais do verán, aínda que a súa frecuencia diminúe durante as fins de semana.