The Late Preterm Birth Rate and Its Association with Comorbidities in a Population-Based Study

Abstract Objectives: to describe the prevalence of late preterm birth (LPB) and identify factors associated with its occurrence in the municipality of Rio Grande, RS. Methods: a standardized questionnaire was applied to allpuerperal women resident in the municipality who had children in theyear 2013. Preterm birth was defined as birth occur-ring between the 34th and 36th week of gestation, preferably evaluated by means of ultra-sonography in the 6th to 20th weeks. The analysis used Poisson regression with robust adjustment of variance, following the hierarchical model.The effect measure used was the preva-lence ratio (PR). Results: of the 2286 births included in the study, 11.8% (CI95%: 10.5-13.1) were LPBs. After adjusted analysis, the PRfor occurrence of LPB among black-skinned motherswas 1.40 (1.01-1.96) in relation to white-skinned women; 1.74 (1.23-2.45) among those who attended less than sixprenatal consults compared to those who attended nine or more; the PR was 1.36 (1.11-1.68) for those classified as depressives compared to others and 1.29 (1.01-1.65) for those undergoing caesarian. Conclusions: the results suggest the existence of inequality in relation to skin color and the important impact of the number ofprenatal consults on the outcome. More appropriately designed studies are needed to confirm the causal relation among maternal depression, caesarian and LPB.

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Changes in incidence of iatrogenic and spontaneous preterm births over time: a population-based study

Journal of Perinatal Medicine ◽

10.1515/jpm-2015-0271 ◽

2016 ◽

Vol 44 (5) ◽

Cited By ~ 13

Author(s):

Miha Lucovnik ◽

Andreja Trojner Bregar ◽

Lili Steblovnik ◽

Ivan Verdenik ◽

Ksenija Gersak ◽

...

Keyword(s):

Preterm Birth ◽

Birth Rate ◽

Preterm Births ◽

Population Based ◽

Spontaneous Preterm Birth ◽

Birth Rates ◽

Population Based Study ◽

Preterm Birth Rate ◽

Iatrogenic Preterm Delivery ◽

Over Time

AbstractTo examine the proportion of iatrogenic births among all preterm births over a 26-year period.A registry-based survey of preterm deliveries between 1987 and 2012 analyzed by the onset of labor: spontaneous with intact membranes, preterm premature rupture of membranes (PPROM) or iatrogenic. Stratification into categories by gestation (22 weeks to 27 weeks and 6 days, 28 weeks to 31 weeks and 6 days, 32 weeks to 33 weeks and 6 days, 34 weeks to 36 weeks and 6 days) was performed. Preterm birth rates were analyzed using the Mantel-Haenszel linear-by-linear associationOverall preterm birth rate was 5.9% (31328 deliveries) including 2358 (0.4%) before 28 completed weeks, 3388 (0.6%) between 28 weeks and 31 weeks 6 days, 3970 (0.8%) between 32 weeks and 33 weeks and 6 days, and 21611 (4.1%) between 34 weeks and 36 weeks and 6 days There was an increase in overall preterm birth rate (P<0.001). The rate of iatrogenic preterm births and PPROM increased over time (P<0.001 and P<0.014, respectively). Rates of spontaneous preterm birth decreased (P<0.001). After accounting for potential confounders, year of birth remained an independent risk factor for iatrogenic preterm delivery in all four gestational age categories (P<0.001).The incidence of iatrogenic preterm birth is increasing with a concomitant decrease in the incidence of spontaneous preterm birth. Attempts to analyze, interpret and decrease preterm birth rates should consider spontaneous and iatrogenic preterm births separately.

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The contribution of twins conceived by assisted reproduction technology to the very preterm birth rate: a population-based study

European Journal of Obstetrics & Gynecology and Reproductive Biology ◽

10.1016/j.ejogrb.2013.09.040 ◽

2013 ◽

Vol 171 (2) ◽

pp. 311-313 ◽

Cited By ~ 8

Author(s):

Natasa Tul ◽

Miha Lucovnik ◽

Ivan Verdenik ◽

Mirjam Druskovic ◽

Ziva Novak ◽

...

Keyword(s):

Preterm Birth ◽

Assisted Reproduction ◽

Birth Rate ◽

Population Based ◽

Population Based Study ◽

Very Preterm ◽

Assisted Reproduction Technology ◽

Very Preterm Birth ◽

Preterm Birth Rate

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Long-term trends in spontaneous and iatrogenic late preterm birth in South Australia - A population-based study 1986-2014

Journal of Paediatrics and Child Health ◽

10.1111/jpc.13494_317 ◽

2017 ◽

Vol 53 ◽

pp. 107-108

Keyword(s):

Preterm Birth ◽

South Australia ◽

Population Based ◽

Late Preterm ◽

Population Based Study ◽

Late Preterm Birth ◽

Long Term Trends

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Economic costs associated with moderate and late preterm birth: a prospective population-based study

BJOG An International Journal of Obstetrics & Gynaecology ◽

10.1111/1471-0528.13515 ◽

2015 ◽

Vol 122 (11) ◽

pp. 1495-1505 ◽

Cited By ~ 37

Author(s):

KA Khan ◽

S Petrou ◽

M Dritsaki ◽

SJ Johnson ◽

B Manktelow ◽

...

Keyword(s):

Preterm Birth ◽

Population Based ◽

Late Preterm ◽

Economic Costs ◽

Population Based Study ◽

Late Preterm Birth

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Are COVID-19 mitigation measures reducing preterm birth rate in China?

BMJ Global Health ◽

10.1136/bmjgh-2021-006359 ◽

2021 ◽

Vol 6 (8) ◽

pp. e006359

Author(s):

Zheng Bian ◽

Xiaoxian Qu ◽

Hao Ying ◽

Xiaohua Liu

Keyword(s):

Preterm Birth ◽

Birth Rate ◽

Time Window ◽

Time Windows ◽

Mitigation Measures ◽

Late Preterm Birth ◽

Child Morbidity ◽

Preterm Birth Rate ◽

Underlying Mechanisms ◽

The Impact

ObjectivePreterm birth is the leading cause of child morbidity and mortality globally. We aimed to determine the impact of the COVID-19 mitigation measures implemented in China on 23 January 2020 on the incidence of preterm birth in our institution.DesignLogistic regression analysis was used to investigate the association between the national COVID-19 mitigation measures implemented in China and the incidence of preterm birth.SettingShanghai First Maternity and Infant Hospital, Shanghai China.ParticipantsAll singleton deliveries abstracted from electronic medical record between 1 January 2014 to 31 December 2020.Main outcome measuresPreterm birth rate.ResultsData on 164 107 singleton deliveries were available. COVID-19 mitigation measures were consistently associated with significant reductions in preterm birth in the 2-month, 3-month, 4-month, 5-month time windows after implementation (+2 months, OR 0.80, 95% CI 0.69 to 0.94; +3 months, OR 0.83, 95% CI 0.73 to 0.94; +4 months, OR 0.82, 95% CI 0.73 to 0.92; +5 months, OR 0.84, 95% CI 0.76 to 0.93). These reductions in preterm birth were obvious across various degrees of prematurity, but were statistically significant only in moderate-to-late preterm birth (32 complete weeks to 36 weeks and 6 days) subgroup. The preterm birth difference disappeared gradually after various restrictions were removed (7th–12th month of 2020, OR 1.02, 95% CI 0.94 to 1.11). There was no difference in stillbirth rate across the study time window.ConclusionSubstantial decreases in preterm birth rates were observed following implementation of the national COVID-19 mitigation measures in China. Further study is warranted to explore the underlying mechanisms associated with this observation.

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