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Feb 7, 2021 · The main results of this study were: (1) At 24 weeks’ gestation, only 10% of women had CL < 26 mm; (2) The risk of PTB was inversely related to CL; (3) a CL < 26 mm at 24 weeks had a better predictive value compared to CL < 26 mm at 28 weeks (RR 6.1 vs. 5.3) for predicting PTB < 35 weeks.
A history of a prior SPTB is one of the strongest known risk factors for SPTB. 8,9 In addition, women with a history of a prior SPTB and a short CL seem to be at the highest risk. 10 In the multicenter Preterm Prediction Study, 11 the predicted preterm birth (PTB) recurrence risk increased as CL shortened, regardless of fetal fibronectin result.
- Moeun Son, Emily S. Miller
- 10.1053/j.semperi.2017.08.002
- 2017
- 2017/12
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- Data Source and Participants
- Data Collection
- Definition
- Model Development and Validation
- Sample Size and Model Power
- Statistical Analysis
Data used in this case-control study were extracted from the National Vital Statistics System (NVSS) database between 2018 and 2019 . The NVSS compiles the information from birth certificates and makes data files for each year, which is open access. The National Center for Health Statistics (NCHS) receives these electronic information files from th...
Data of pregnant women were collected including age (< 35 years and ≥ 35 years), race (white, black, and others), education (high school or below, bachelor, and master or above), pre-pregnancy body mass index (BMI) (underweight, normal, overweight, and obesity), prenatal care (yes or no), pregnancy smoking (yes or no), pre-pregnancy diabetes (yes o...
Preterm birth
Preterm birth means births occurring before 37 completed weeks of gestation are preterm for purposes of classification consistent with the ICD-9 (International Classification of Diseases, Ninth Revision) and ICD-10 (International Classification of Diseases, Tenth Revision) definitions.
Education
Educational status was divided into three categories, high school or below, bachelor, and master or above. 8th grade or less, 9th through 12th grade with no diploma, high school graduate or GED completed, some college credit, but not a degree, associate degree (AA, AS) combined into high school and below. Master’s degree (MA, MS, MEng, MEd, MSW, MBA) and doctorate (PhD, EdD) or professional degree (MD, DDS, DVM, LLB, JD) merged into master’s degree and above.
Pre-pregnancy BMI
Pre-pregnancy BMI was calculated as: [mother’s pre-pregnancy weight (lb) / [mother’s height (in)]2] * 703 . Pre-pregnancy BMI: underweight (< 18.5 kg/m2), normal (18.5–24.9 kg/m2), overweight (25–29.9 kg/m2), obesity (≥30 kg/m2). In this study Obesity I: 30.0–34.9, Obesity II: 35.0–39.9, Obesity III: ≥40.0 combined into obesity (≥30 kg/m2).
The 2019 data were randomly divided into the training set and testing set with a ratio of 1:1. Univariate and multivariate logistic regression analyses were conducted. Variables that were statistically significant in univariate analysis were included in multivariate analysis using backward stepwise regression. The odds ratio (OR) and 95% confidence...
The sample size was calculated using the PASS 15.0.5 software (NCSS, LLC, Kaysville, UT, USA). Calculations of sample size and model power were shown in Supplement Fig. 1. The proportions of the general pregnant population who experienced age ≥ 35 (17.2%), pre-pregnancy underweight (6.0%), pregnancy smoking (5.2%), gestation diabetes (11.0%), gesta...
Categorical variables were described in numbers and percentages [n (%)] and the groups were compared using χ2 tests or Fisher’s exact tests. SAS 9.4 software (SAS Institute Inc., Cary, NC, USA) was used for analysis. R 4.02 software (Institute for Statistics and Mathematics, Vienna, Austria) was used to draw logistic prediction model nomogram. Pyth...
Sep 14, 2022 · Higher education level of pregnant women [bachelor (OR = 0.82; 95%CI, 0.81–0.84); master or above (OR = 0.82; 95%CI, 0.81–0.83)], pre-pregnancy overweight (OR = 0.96; 95%CI, 0.95–0.98) and obesity (OR = 0.94; 95%CI, 0.93–0.96), and prenatal care (OR = 0.48; 95%CI, 0.47–0.50) were associated with a reduced risk of preterm birth, while ...
- 10.1186/s12887-022-03591-w
- 2022
- BMC Pediatr. 2022; 22: 547.
Feb 1, 2019 · The strongest predictor of preterm birth is a previous preterm birth or late miscarriage; these are associated with a 32% chance of a recurrent preterm birth [7]. Women with a previous preterm birth or late miscarriage, as well as those who have had previous cervical excisional surgery, are generally included in this group of asymptomatic women ...
- Natalie Suff, Lisa Story, Andrew Shennan
- 2019
PTB is difficult to predict. Prediction means to identify women at risk for preterm delivery within relatively short time interval (usually within 48 hours, 7–14 days). A test with high negative predictive value and a high positive predictive value would offer the best result.
Preterm birth is when a baby is born too early, before 37 weeks of pregnancy have been completed. In 2022, preterm birth affected about 1 of every 10 infants born in the United States (see Births in the United States, 2022). The preterm birth rate declined 1% in 2022 to 10.4%, following an increase of 4% from 2020 to 2021.
