National and regional estimates of term and preterm babies born small for gestational age in 138 low-income and middle-income countries in 2010

Background National estimates for the numbers of babies born small for gestational age and the comorbidity with preterm birth are unavailable. We aimed to estimate the prevalence of term and preterm babies born small for gestational age (term-SGA and preterm-SGA), and the relation to low birthweight (\u3c2500 \u3eg), in 138 countries of low and middle income in 2010. Methods Small for gestational age was defined as lower than the 10th centile for fetal growth from the 1991 US national reference population. Data from 22 birth cohort studies (14 low-income and middle-income countries) and from the WHO Global Survey on Maternal and Perinatal Health (23 countries) were used to model the prevalence of term-SGA births. Prevalence of preterm-SGA infants was calculated from meta-analyses. Findings In 2010, an estimated 32·4 million infants were born small for gestational age in low-income and middle-income countries (27% of livebirths), of whom 10·6 million infants were born at term and low birthweight. The prevalence of term-SGA babies ranged from 5·3% of livebirths in east Asia to 41·5% in south Asia, and the prevalence of preterm-SGA infants ranged from 1·2% in north Africa to 3·0% in southeast Asia. Of 18 million low-birthweight babies, 59% were term-SGA and 41% were preterm-SGA. Two-thirds of small-for-gestational-age infants were born in Asia (17·4 million in south Asia). Preterm-SGA babies totalled 2·8 million births in low-income and middle-income countries. Most small-for-gestational-age infants were born in India, Pakistan, Nigeria, and Bangladesh. Interpretation The burden of small-for-gestational-age births is very high in countries of low and middle income and is concentrated in south Asia. Implementation of effective interventions for babies born too small or too soon is an urgent priority to increase survival and reduce disability, stunting, and non-communicable diseases

Prevalence of small-for-gestational age and its mortality risk varies by choice of birth-weight-for-gestation reference population

Background We use data from rural Nepal and South India to compare the prevalence of small-for-gestational-age (SGA) and neonatal mortality risk associated with SGA using different birth-weight-for-gestation reference populations. Methods We identified 46 reference populations in low-, middle-, and high-income countries, of which 26 met the inclusion criteria of being commonly cited and having numeric 10th percentile cut points published. Those reference populations were then applied to populations from two community-based studies to determine SGA prevalence and its relative risk of neonatal mortality. Results The prevalence of SGA ranged from 10.5% to 72.5% in Nepal, and 12.0% to 78.4% in India, depending on the reference population. Females had higher rates of SGA than males using reference populations that were not sex specific. SGA prevalence was lowest when using reference populations from low-income countries. Infants who were both preterm and SGA had much higher mortality risk than those who were term and appropriate-for-gestational-age. Risk ratios for those who are both preterm and SGA ranged from 7.34–17.98 in Nepal and 5.29–11.98 in India, depending on the reference population. Conclusions These results demonstrate the value of a common birth-weight-for-gestation reference population that will facilitate comparisons of SGA prevalence and mortality risk across research studies

Comparison of the performances of male and female armed services recruits undergoing sports vision testing

Research has shown that a strong correlation exists between vision and performance. In the sporting environment, it is believed that athletes perform better than non-athletes and males perform better than females. In this study we used sports vision to compare performance between males and females. One hundred and thirty male and one hundred female armed service recruits were tested, using techniques of visualization, eye-hand coordination, focusing, sequencing, tracking and reflexes. Previous research has shown that the difference in performance in both males and females is the result of brain lateralization, test familiarity and nerve conduction velocity in the brain. This was, however, not reflected in the study. Results showed a significant difference in performance with regard to visualization (p=0.006), tracking (p=0.048), reflexes (p=0.0001) and sequencing (p=0.046). The increased performance might become more evident with repetition of tests. Future research should therefore investigate the exact physiological mechanisms and interrelation of variables thought to affect performance.http://www.ajol.info/journal_index.php?jid=153&ab=ajpher

Detectable clonal mosaicism and its relationship to aging and cancer

In an analysis of 31,717 cancer cases and 26,136 cancer-free controls from 13 genome-wide association studies, we observed large chromosomal abnormalities in a subset of clones in DNA obtained from blood or buccal samples. We observed mosaic abnormalities, either aneuploidy or copy-neutral loss of heterozygosity, of >2 Mb in size in autosomes of 517 individuals (0.89%), with abnormal cell proportions of between 7% and 95%. In cancer-free individuals, frequency increased with age, from 0.23% under 50 years to 1.91% between 75 and 79 years (P = 4.8 × 10(-8)). Mosaic abnormalities were more frequent in individuals with solid tumors (0.97% versus 0.74% in cancer-free individuals; odds ratio (OR) = 1.25; P = 0.016), with stronger association with cases who had DNA collected before diagnosis or treatment (OR = 1.45; P = 0.0005). Detectable mosaicism was also more common in individuals for whom DNA was collected at least 1 year before diagnosis with leukemia compared to cancer-free individuals (OR = 35.4; P = 3.8 × 10(-11)). These findings underscore the time-dependent nature of somatic events in the etiology of cancer and potentially other late-onset diseases

Female chromosome X mosaicism is age-related and preferentially affects the inactivated X chromosome

To investigate large structural clonal mosaicism of chromosome X, we analysed the SNP microarray intensity data of 38,303 women from cancer genome-wide association studies (20,878 cases and 17,425 controls) and detected 124 mosaic X events42Mb in 97 (0.25%) women. Here we show rates for X-chromosome mosaicism are four times higher than mean autosomal rates; X mosaic events more often include the entire chromosome and participants with X events more likely harbour autosomal mosaic events. X mosaicism frequency increases with age (0.11% in 50-year olds; 0.45% in 75-year olds), as reported for Y and autosomes. Methylation array analyses of 33 women with X mosaicism indicate events preferentially involve the inactive X chromosome. Our results provide further evidence that the sex chromosomes undergo mosaic events more frequently than autosomes, which could have implications for understanding the underlying mechanisms of mosaic events and their possible contribution to risk for chronic diseases

Injections during labor and intrapartum-related hypoxic injury and mortality in rural southern Nepal

Objective To estimate the association between unmonitored use of injections during labor and intrapartum-related neonatal mortality and morbidity among home births. Methods Recently delivered women in Sarlahi, Nepal, reported whether they had received injections during labor. Data on breathing and crying status at birth, time to first breath, respiratory rate, sucking ability, and lethargy were gathered. Neonatal respiratory depression (NRD) and encephalopathy (NE) were compared by injection receipt status using multivariate regression models. Results Injections during labor were frequently reported (7108 of 22 352 [31.8%]) and were predominantly given by unqualified village doctors. Multivariate analysis (excluding facility births and complicated deliveries) revealed associations with intrapartum-related NRD (relative risk [RR] 2.52; 95% CI, 2.29-2.78) and NE (RR 3.48; 95% CI, 2.46-4.93). The risks of neonatal death associated with intrapartum-related NRD (RR 3.78; 95% CI, 2.53-5.66) or NE (RR 4.47; 95% CI, 2.78-7.19) were also elevated. Conclusion Injection during labor was widespread at the community level. This practice was associated with poor outcomes and possibly related to the inappropriate use of uterotonics by unqualified providers. Interventions are required to increase the safety of childbirth in the community and in peripheral health facilities. Parent trial registered at clinicaltrials.gov (NCT00 109616). © 2013 International Federation of Gynecology and Obstetrics

Incidence of and risk factors for neonatal respiratory depression and encephalopathy in rural Sarlahi, Nepal

OBJECTIVES: To characterize the incidence of, risk factors for, and neonatal morbidity and mortality associated with respiratory depression at birth and neonatal encephalopathy (NE) among term infants in a developing country. METHODS: Data were collected prospectively in 2002-2006 during a community-based trial that enrolled 23 662 newborns in rural Nepal and evaluated the impact of umbilical-cord and skin cleansing on neonatal morbidity and mortality rates. Respiratory depression at birth and NE were defined on the basis of symptoms from maternal reports and study-worker observations during home visits. RESULTS: Respiratory depression at birth was reported for 19.7% of live births, and 79% of cases involved term infants without congenital anomalies. Among newborns with probable intrapartum-related respiratory depression (N = 3465), 112 (3%) died before their first home visit (presumed severe NE), and 178 (5%) eventually developed symptoms of NE. Overall, 629 term infants developed NE (28.1 cases per 1000 live births); 2% of cases were associated with congenital anomalies, 25% with infections, and 28% with a potential intrapartum event. The incidence of intrapartum-related NE was 13.0 cases per 1000 live births; the neonatal case fatality rate was 46%. Infants with NE more frequently experienced birth complications and were male, of multiple gestation, or born to nulliparous mothers. CONCLUSIONS: In Sarlahi, the incidence of neonatal respiratory depression and NE, associated neonatal case fatality, and morbidity prevalence are high. Action is required to increase coverage of skilled obstetric/neonatal care in this setting and to evaluate long-term impairments. Copyright © 2011 by the American Academy of Pediatrics

Risk factors for neonatal mortality due to birth asphyxia in southern Nepal: A prospective, community-based cohort study

OBJECTIVE. Our goal was to identify antepartum, intrapartum, and infant risk factors for birth asphyxia mortality in a rural, low-resource, population-based cohort in southern Nepal. PATIENTS AND METHODS.Data were collected prospectively during a cluster-randomized, community-based trial evaluating the impact of newborn skin and umbilical cord cleansing on neonatal mortality and morbidity in Sarlahi, Nepal. A total of 23 662 newborn infants were enrolled between September 2002 and January 2006. Multi-variable regression modeling was performed to determine adjusted relative risk estimates of birth asphyxia mortality for antepartum, intrapartum, and infant risk factors. © 2008 by the American Academy of Pediatrics