Background: Preterm birth remains a common cause of neonatal mortality with a disproportionate burden occurring in low and middle-income countries. Meta-analyses of lowdose aspirin to prevent preeclampsia suggest that the incidence of preterm birth may be decreased, particularly if initiated before 16 weeks. Methods: We conducted a multi-country randomized, double masked trial of aspirin (81 mg) daily compared to placebo initiated between 6 weeks and 0 days of pregnancy and 13 weeks and 6 days of pregnancy in nulliparous women. Prior to randomization, ultrasound confirmed the gestational age and presence of a singleton viable pregnancy. The primary outcome was preterm birth, defined as delivery at or after 20 weeks and prior to 37 weeks gestational age. Results: A total of 11,976 women in 6 countries (India, Guatemala, Pakistan, Kenya, Zambia, Democratic Republic of Congo) were randomly assigned to aspirin (5,990 women) or placebo (5,986 women). Preterm birth occurred in 11.6% of women randomized to aspirin and 13.1% randomized to placebo (RR, 0.89; 95% CI, 0.81 to 0.98). Women who took aspirin were also less likely to deliver before 34 weeks gestation (3.3% vs 4.0%; RR, 0.75; 95%CI, 0.61 to 0.93) or experience perinatal mortality (45.7/1000 vs 53.6/1000; RR, 0.86; 95%CI, 0.73 to 1.00). Adverse maternal events were similar between the two groups. Conclusions: In nulliparous women with singleton pregnancies, low dose aspirin initiated between 6 weeks and 0 days and 13 weeks and 6 days results in lower rates of preterm delivery before 37 weeks and before 34 weeks.
ObjectivesTo study the trend in the prevalence of anaemia and low BMI among pregnant women from Eastern Maharashtra and evaluate if low BMI and anaemia affect pregnancy outcomes.DesignProspective observational cohort study.SettingCatchment areas of 20 rural primary health centres in four eastern districts of Maharashtra State, India.Participants72 750 women from the Nagpur site of Maternal and Newborn Health Registry of NIH’s Global Network, enrolled from 2009 to 2016.Main outcome measuresMode of delivery, pregnancy related complications at delivery, stillbirths, neonatal deaths and low birth weight (LBW) in babies.ResultsOver 90% of the women included in the study were anaemic and over a third were underweight (BMI <18 kg/m2) and with both conditions. Mild anaemia at any time during delivery significantly increased the risk (Risk ratio; 95% confidence interval (RR;(95% CI)) of stillbirth (1.3 (1.1–1.6)), neonatal deaths (1.3 (1–1.6)) and LBW babies (1.1 (1–1.2)). The risks became even more significant and increased further with moderate/severe anaemia any time during pregnancy for stillbirth (1.4 (1.2–1.8)), neonatal deaths (1.7 (1.3–2.1)) and LBW babies (1.3 (1.2–1.4)).,. Underweight at anytime during pregnancy increased the risk of neonatal deaths (1.1 (1–1.3)) and LBW babies (1.2;(1.2–1.3)). The risk of having stillbirths (1.5;(1.2–1.8)), neonatal deaths (1.7;(1.3–2.3)) and LBW babies (1.5;(1.4–1.6)) was highest when - the anaemia and underweight co-existed in the included women. Obesity/overweight during pregnancy increased the risk of maternal complications at delivery (1.6;(1.5–1.7)) and of caesarean section (1.5;(1.4–1.6)) and reduced the risk of LBW babies 0.8 (0.8–0.9)).ConclusionMaternal anaemia is associated with enhanced risk of stillbirth, neonatal deaths and LBW. The risks increased if anaemia and underweight were present simultaneously.Trial registration numberNCT01073475.
In the past years a wide discussion has been held among asphalt researchers regarding the existence and interpretation of observed microstructures on bitumen surfaces. To investigate this, the RILEM technical committee on nano bituminous materials 231-NBM has conducted a round robin study combining differential scanning calorimetry (DSC) and Atomic Force Microscopy (AFM). From this, methods for performing DSC and AFM tests on bitumen samples and determination of the influence of wax on the observed phases, taking into account thermal history, sample preparation and annealing procedure, are presented and critically discussed. DSC is used to measure various properties and phenomena that indicate physical changes such as glass transition temperature (T g) and phase transition such as melting and crystallization. In the case of existence of wax, either natural or synthetic, it can further indicate the melting point of wax, that could be used to determine wax content. The results from seven laboratories show
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